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qemu/0062-megasas-always-store-SCSIRequest-in.patch

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From 5e011980d6a696192ce807c21c145d738668d040 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Sat, 10 Jun 2017 14:04:51 -0600
Subject: [PATCH] megasas: always store SCSIRequest* into MegasasCmd
This ensures that the request is unref'ed properly, and avoids a
segmentation fault in the new qtest testcase that is added.
Reported-by: Zhangyanyu <zyy4013@stu.ouc.edu.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[BR: BSC#1043296 CVE-2017-9503, dropped testcase from patch]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
hw/scsi/megasas.c | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 887958481b..a0cafe3010 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -607,6 +607,9 @@ static void megasas_reset_frames(MegasasState *s)
static void megasas_abort_command(MegasasCmd *cmd)
{
/* Never abort internal commands. */
+ if (cmd->dcmd_opcode != -1) {
+ return;
+ }
if (cmd->req != NULL) {
scsi_req_cancel(cmd->req);
}
@@ -1014,7 +1017,6 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
uint64_t pd_size;
uint16_t pd_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
uint8_t cmdbuf[6];
- SCSIRequest *req;
size_t len, resid;
if (!cmd->iov_buf) {
@@ -1023,8 +1025,8 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
info->inquiry_data[0] = 0x7f; /* Force PQual 0x3, PType 0x1f */
info->vpd_page83[0] = 0x7f;
megasas_setup_inquiry(cmdbuf, 0, sizeof(info->inquiry_data));
- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"PD get info std inquiry");
g_free(cmd->iov_buf);
@@ -1033,26 +1035,26 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
}
trace_megasas_dcmd_internal_submit(cmd->index,
"PD get info std inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
} else if (info->inquiry_data[0] != 0x7f && info->vpd_page83[0] == 0x7f) {
megasas_setup_inquiry(cmdbuf, 0x83, sizeof(info->vpd_page83));
- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"PD get info vpd inquiry");
return MFI_STAT_FLASH_ALLOC_FAIL;
}
trace_megasas_dcmd_internal_submit(cmd->index,
"PD get info vpd inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
}
@@ -1214,7 +1216,6 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
struct mfi_ld_info *info = cmd->iov_buf;
size_t dcmd_size = sizeof(struct mfi_ld_info);
uint8_t cdb[6];
- SCSIRequest *req;
ssize_t len, resid;
uint16_t sdev_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
uint64_t ld_size;
@@ -1223,8 +1224,8 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
cmd->iov_buf = g_malloc0(dcmd_size);
info = cmd->iov_buf;
megasas_setup_inquiry(cdb, 0x83, sizeof(info->vpd_page83));
- req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
- if (!req) {
+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
+ if (!cmd->req) {
trace_megasas_dcmd_req_alloc_failed(cmd->index,
"LD get info vpd inquiry");
g_free(cmd->iov_buf);
@@ -1233,10 +1234,10 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
}
trace_megasas_dcmd_internal_submit(cmd->index,
"LD get info vpd inquiry", lun);
- len = scsi_req_enqueue(req);
+ len = scsi_req_enqueue(cmd->req);
if (len > 0) {
cmd->iov_size = len;
- scsi_req_continue(req);
+ scsi_req_continue(cmd->req);
}
return MFI_STAT_INVALID_STATUS;
}
@@ -1865,7 +1866,7 @@ static void megasas_command_complete(SCSIRequest *req, uint32_t status,
return;
}
- if (cmd->req == NULL) {
+ if (cmd->dcmd_opcode != -1) {
/*
* Internal command complete
*/