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Accepting request 898228 from home:jziviani:branches:Virtualization

- Fix out-of-bounds write in virgl_cmd_get_capset
  CVE-2021-3546 bsc#1185981
  vhost-user-gpu-abstract-vg_cleanup_mappi.patch
- Fix memory leaks found in the virtio vhost-user GPU device
  CVE-2021-3544
  vhost-user-gpu-fix-leak-in-virgl_cmd_res.patch
  vhost-user-gpu-fix-leak-in-virgl_resourc.patch
  vhost-user-gpu-fix-memory-disclosure-in-.patch
  vhost-user-gpu-fix-memory-leak-in-vg_res.patch
  vhost-user-gpu-fix-memory-leak-while-cal.patch
  vhost-user-gpu-fix-OOB-write-in-virgl_cm.patch
- Fix information disclosure due to uninitialized memory read
  CVE-2021-3545 bsc#1185990
  vhost-user-gpu-fix-resource-leak-in-vg_r.patch

OBS-URL: https://build.opensuse.org/request/show/898228
OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=653
This commit is contained in:
José Ricardo Ziviani 2021-06-08 00:27:26 +00:00 committed by Git OBS Bridge
parent b32969ef5a
commit 9e49deb609
11 changed files with 481 additions and 2 deletions

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@ -1,3 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:0300c7a1fdea7e0c7c20b707481ea1894523eee636f7746cc50d5d12425036b2
size 58808
oid sha256:09f26a3085d3c590edd7686b07b2b616cf634538ca073bba97a28323140081f5
size 51544

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@ -1,3 +1,21 @@
-------------------------------------------------------------------
Mon Jun 7 18:13:50 UTC 2021 - José Ricardo Ziviani <jose.ziviani@suse.com>
- Fix out-of-bounds write in virgl_cmd_get_capset
CVE-2021-3546 bsc#1185981
vhost-user-gpu-abstract-vg_cleanup_mappi.patch
- Fix memory leaks found in the virtio vhost-user GPU device
CVE-2021-3544
vhost-user-gpu-fix-leak-in-virgl_cmd_res.patch
vhost-user-gpu-fix-leak-in-virgl_resourc.patch
vhost-user-gpu-fix-memory-disclosure-in-.patch
vhost-user-gpu-fix-memory-leak-in-vg_res.patch
vhost-user-gpu-fix-memory-leak-while-cal.patch
vhost-user-gpu-fix-OOB-write-in-virgl_cm.patch
- Fix information disclosure due to uninitialized memory read
CVE-2021-3545 bsc#1185990
vhost-user-gpu-fix-resource-leak-in-vg_r.patch
-------------------------------------------------------------------
Thu Jun 3 09:43:32 UTC 2021 - Dirk Müller <dmueller@suse.com>

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@ -192,6 +192,14 @@ Patch00056: vhost-user-blk-Get-more-feature-flags-fr.patch
Patch00057: virtio-Fail-if-iommu_platform-is-request.patch
Patch00058: vhost-user-blk-Check-that-num-queues-is-.patch
Patch00059: vfio-ccw-Permit-missing-IRQs.patch
Patch00060: vhost-user-gpu-fix-memory-disclosure-in-.patch
Patch00061: vhost-user-gpu-fix-resource-leak-in-vg_r.patch
Patch00062: vhost-user-gpu-fix-memory-leak-in-vg_res.patch
Patch00063: vhost-user-gpu-fix-memory-leak-while-cal.patch
Patch00064: vhost-user-gpu-fix-leak-in-virgl_cmd_res.patch
Patch00065: vhost-user-gpu-fix-leak-in-virgl_resourc.patch
Patch00066: vhost-user-gpu-fix-OOB-write-in-virgl_cm.patch
Patch00067: vhost-user-gpu-abstract-vg_cleanup_mappi.patch
# Patches applied in roms/seabios/:
Patch01000: seabios-use-python2-explicitly-as-needed.patch
Patch01001: seabios-switch-to-python3-as-needed.patch
@ -1084,6 +1092,14 @@ This package records qemu testsuite results and represents successful testing.
%patch00057 -p1
%patch00058 -p1
%patch00059 -p1
%patch00060 -p1
%patch00061 -p1
%patch00062 -p1
%patch00063 -p1
%patch00064 -p1
%patch00065 -p1
%patch00066 -p1
%patch00067 -p1
%patch01000 -p1
%patch01001 -p1
%patch01002 -p1

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@ -0,0 +1,133 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:04:03 -0700
Subject: vhost-user-gpu: abstract vg_cleanup_mapping_iov
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 3ea32d1355d446057c17458238db2749c52ee8f0
References: CVE-2021-3546 bsc#1185981
CVE-2021-3545 bsc#1185990
CVE-2021-3544
Currently in vhost-user-gpu, we free resource directly in
the cleanup case of resource. If we change the cleanup logic
we need to change several places, also abstruct a
'vg_create_mapping_iov' can be symmetry with the
'vg_create_mapping_iov'. This is like what virtio-gpu does,
no function changed.
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-9-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/vhost-user-gpu.c | 24 ++++++++++++++++++++----
contrib/vhost-user-gpu/virgl.c | 9 +++++----
contrib/vhost-user-gpu/vugpu.h | 2 +-
3 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c b/contrib/vhost-user-gpu/vhost-user-gpu.c
index 770dfad52989b2651eea67fdbb1b..6dc6a44f4e263bfb31ba9ba6ff32 100644
--- a/contrib/vhost-user-gpu/vhost-user-gpu.c
+++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
@@ -49,6 +49,8 @@ static char *opt_render_node;
static gboolean opt_virgl;
static void vg_handle_ctrl(VuDev *dev, int qidx);
+static void vg_cleanup_mapping(VuGpu *g,
+ struct virtio_gpu_simple_resource *res);
static const char *
vg_cmd_to_string(int cmd)
@@ -400,7 +402,7 @@ vg_resource_destroy(VuGpu *g,
}
vugbm_buffer_destroy(&res->buffer);
- g_free(res->iov);
+ vg_cleanup_mapping(g, res);
pixman_image_unref(res->image);
QTAILQ_REMOVE(&g->reslist, res, next);
g_free(res);
@@ -504,6 +506,22 @@ vg_resource_attach_backing(VuGpu *g,
res->iov_cnt = ab.nr_entries;
}
+/* Though currently only free iov, maybe later will do more work. */
+void vg_cleanup_mapping_iov(VuGpu *g,
+ struct iovec *iov, uint32_t count)
+{
+ g_free(iov);
+}
+
+static void
+vg_cleanup_mapping(VuGpu *g,
+ struct virtio_gpu_simple_resource *res)
+{
+ vg_cleanup_mapping_iov(g, res->iov, res->iov_cnt);
+ res->iov = NULL;
+ res->iov_cnt = 0;
+}
+
static void
vg_resource_detach_backing(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
@@ -522,9 +540,7 @@ vg_resource_detach_backing(VuGpu *g,
return;
}
- g_free(res->iov);
- res->iov = NULL;
- res->iov_cnt = 0;
+ vg_cleanup_mapping(g, res);
}
static void
diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index 7172104b19d7a79eb7cc3404e09f..3e45e1bd33600fe5d91c0eea3af8 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -116,8 +116,9 @@ virgl_cmd_resource_unref(VuGpu *g,
virgl_renderer_resource_detach_iov(unref.resource_id,
&res_iovs,
&num_iovs);
- g_free(res_iovs);
-
+ if (res_iovs != NULL && num_iovs != 0) {
+ vg_cleanup_mapping_iov(g, res_iovs, num_iovs);
+ }
virgl_renderer_resource_unref(unref.resource_id);
}
@@ -294,7 +295,7 @@ virgl_resource_attach_backing(VuGpu *g,
ret = virgl_renderer_resource_attach_iov(att_rb.resource_id,
res_iovs, att_rb.nr_entries);
if (ret != 0) {
- g_free(res_iovs);
+ vg_cleanup_mapping_iov(g, res_iovs, att_rb.nr_entries);
}
}
@@ -314,7 +315,7 @@ virgl_resource_detach_backing(VuGpu *g,
if (res_iovs == NULL || num_iovs == 0) {
return;
}
- g_free(res_iovs);
+ vg_cleanup_mapping_iov(g, res_iovs, num_iovs);
}
static void
diff --git a/contrib/vhost-user-gpu/vugpu.h b/contrib/vhost-user-gpu/vugpu.h
index 04d56158123d3ee1c271302d8f8a..e2864bba68e0d9c1228eb7745c50 100644
--- a/contrib/vhost-user-gpu/vugpu.h
+++ b/contrib/vhost-user-gpu/vugpu.h
@@ -169,7 +169,7 @@ int vg_create_mapping_iov(VuGpu *g,
struct virtio_gpu_resource_attach_backing *ab,
struct virtio_gpu_ctrl_command *cmd,
struct iovec **iov);
-
+void vg_cleanup_mapping_iov(VuGpu *g, struct iovec *iov, uint32_t count);
void vg_get_display_info(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd);
void vg_wait_ok(VuGpu *g);

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@ -0,0 +1,45 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:04:02 -0700
Subject: vhost-user-gpu: fix OOB write in 'virgl_cmd_get_capset'
(CVE-2021-3546)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 9f22893adcb02580aee5968f32baa2cd109b3ec2
References: CVE-2021-3546 bsc#1185981
If 'virgl_cmd_get_capset' set 'max_size' to 0,
the 'virgl_renderer_fill_caps' will write the data after the 'resp'.
This patch avoid this by checking the returned 'max_size'.
virtio-gpu fix: abd7f08b23 ("display: virtio-gpu-3d: check
virgl capabilities max_size")
Fixes: CVE-2021-3546
Reported-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-8-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/virgl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index a16a311d80df19294e4330f7d004..7172104b19d7a79eb7cc3404e09f 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -177,6 +177,10 @@ virgl_cmd_get_capset(VuGpu *g,
virgl_renderer_get_cap_set(gc.capset_id, &max_ver,
&max_size);
+ if (!max_size) {
+ cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+ return;
+ }
resp = g_malloc0(sizeof(*resp) + max_size);
resp->hdr.type = VIRTIO_GPU_RESP_OK_CAPSET;

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@ -0,0 +1,55 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:04:00 -0700
Subject: vhost-user-gpu: fix leak in 'virgl_cmd_resource_unref'
(CVE-2021-3544)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-comit: f6091d86ba9ea05f4e111b9b42ee0005c37a6779
References: CVE-2021-3544
The 'res->iov' will be leaked if the guest trigger following sequences:
virgl_cmd_create_resource_2d
virgl_resource_attach_backing
virgl_cmd_resource_unref
This patch fixes this.
Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 5e8e3c4c75 ("virtio-gpu: fix resource leak
in virgl_cmd_resource_unref"
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-6-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
[jrz: tweaked title to not break spec file]
---
contrib/vhost-user-gpu/virgl.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index 6a332d601f8092c5017e903930e5..c669d73a1dbe93d8faa1474462a9 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -108,9 +108,16 @@ virgl_cmd_resource_unref(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_resource_unref unref;
+ struct iovec *res_iovs = NULL;
+ int num_iovs = 0;
VUGPU_FILL_CMD(unref);
+ virgl_renderer_resource_detach_iov(unref.resource_id,
+ &res_iovs,
+ &num_iovs);
+ g_free(res_iovs);
+
virgl_renderer_resource_unref(unref.resource_id);
}

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@ -0,0 +1,46 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:04:01 -0700
Subject: vhost-user-gpu: fix leak in 'virgl_resource_attach_backing'
(CVE-2021-3544)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 63736af5a6571d9def93769431e0d7e38c6677bf
References: CVE-2021-3544
If 'virgl_renderer_resource_attach_iov' failed, the 'res_iovs' will
be leaked.
Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 33243031da ("virtio-gpu-3d: fix memory leak
in resource attach backing")
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-7-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
[jrz: tweak title to not break spec file]
---
contrib/vhost-user-gpu/virgl.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index c669d73a1dbe93d8faa1474462a9..a16a311d80df19294e4330f7d004 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -287,8 +287,11 @@ virgl_resource_attach_backing(VuGpu *g,
return;
}
- virgl_renderer_resource_attach_iov(att_rb.resource_id,
+ ret = virgl_renderer_resource_attach_iov(att_rb.resource_id,
res_iovs, att_rb.nr_entries);
+ if (ret != 0) {
+ g_free(res_iovs);
+ }
}
static void

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@ -0,0 +1,39 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:03:56 -0700
Subject: vhost-user-gpu: fix memory disclosure in virgl_cmd_get_capset_info
(CVE-2021-3545)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 121841b25d72d13f8cad554363138c360f1250ea
References: CVE-2021-3545 bsc#1185990
Otherwise some of the 'resp' will be leaked to guest.
Fixes: CVE-2021-3545
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 42a8dadc74 ("virtio-gpu: fix information leak
in getting capset info dispatch")
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-2-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/virgl.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index 9e6660c7ab875fe83f366d040c97..6a332d601f8092c5017e903930e5 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -128,6 +128,7 @@ virgl_cmd_get_capset_info(VuGpu *g,
VUGPU_FILL_CMD(info);
+ memset(&resp, 0, sizeof(resp));
if (info.capset_index == 0) {
resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
virgl_renderer_get_cap_set(resp.capset_id,

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@ -0,0 +1,44 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:03:58 -0700
Subject: vhost-user-gpu: fix memory leak in vg_resource_attach_backing
(CVE-2021-3544)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: b9f79858a614d95f5de875d0ca31096eaab72c3b
References: CVE-2021-3544
Check whether the 'res' has already been attach_backing to avoid
memory leak.
Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 204f01b309 ("virtio-gpu: fix memory leak
in resource attach backing")
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-4-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/vhost-user-gpu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c b/contrib/vhost-user-gpu/vhost-user-gpu.c
index b5e153d0d648def62d5700e686c0..0437e52b64604512607e548d01d8 100644
--- a/contrib/vhost-user-gpu/vhost-user-gpu.c
+++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
@@ -489,6 +489,11 @@ vg_resource_attach_backing(VuGpu *g,
return;
}
+ if (res->iov) {
+ cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
+ return;
+ }
+
ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov);
if (ret != 0) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;

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@ -0,0 +1,46 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:03:59 -0700
Subject: vhost-user-gpu: fix memory leak while calling 'vg_resource_unref'
(CVE-2021-3544)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: b7afebcf9e6ecf3cf9b5a9b9b731ed04bca6aa3e
References: CVE-2021-3544
If the guest trigger following sequences, the attach_backing will be leaked:
vg_resource_create_2d
vg_resource_attach_backing
vg_resource_unref
This patch fix this by freeing 'res->iov' in vg_resource_destroy.
Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 5e8e3c4c75 ("virtio-gpu: fix resource leak
in virgl_cmd_resource_unref")
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-5-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/vhost-user-gpu.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c b/contrib/vhost-user-gpu/vhost-user-gpu.c
index 0437e52b64604512607e548d01d8..770dfad52989b2651eea67fdbb1b 100644
--- a/contrib/vhost-user-gpu/vhost-user-gpu.c
+++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
@@ -400,6 +400,7 @@ vg_resource_destroy(VuGpu *g,
}
vugbm_buffer_destroy(&res->buffer);
+ g_free(res->iov);
pixman_image_unref(res->image);
QTAILQ_REMOVE(&g->reslist, res, next);
g_free(res);

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@ -0,0 +1,37 @@
From: Li Qiang <liq3ea@163.com>
Date: Sat, 15 May 2021 20:03:57 -0700
Subject: vhost-user-gpu: fix resource leak in 'vg_resource_create_2d'
(CVE-2021-3544)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 86dd8fac2acc366930a5dc08d3fb1b1e816f4e1e
References: CVE-2021-3544
Call 'vugbm_buffer_destroy' in error path to avoid resource leak.
Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-3-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
contrib/vhost-user-gpu/vhost-user-gpu.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c b/contrib/vhost-user-gpu/vhost-user-gpu.c
index f73f292c9f72395525c51c8bd9fb..b5e153d0d648def62d5700e686c0 100644
--- a/contrib/vhost-user-gpu/vhost-user-gpu.c
+++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
@@ -349,6 +349,7 @@ vg_resource_create_2d(VuGpu *g,
g_critical("%s: resource creation failed %d %d %d",
__func__, c2d.resource_id, c2d.width, c2d.height);
g_free(res);
+ vugbm_buffer_destroy(&res->buffer);
cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
return;
}