From 75e2bbd9eb1645c7acb1929ca700913a6e2f54d6 Mon Sep 17 00:00:00 2001 From: Peter Lieven Date: Tue, 24 May 2016 10:59:28 +0200 Subject: [PATCH] block/iscsi: avoid potential overflow of acb->task->cdb at least in the path via virtio-blk the maximum size is not restricted. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Lieven Message-Id: <1464080368-29584-1-git-send-email-pl@kamp.de> Signed-off-by: Paolo Bonzini (cherry picked from commit a6b3167fa0e825aebb5a7cd8b437b6d41584a196) [BR: CVE-2016-5126 BSC#982285] Signed-off-by: Bruce Rogers --- block/iscsi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/iscsi.c b/block/iscsi.c index 302baf8..172e6cf 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -837,6 +837,13 @@ static BlockAIOCB *iscsi_aio_ioctl(BlockDriverState *bs, return &acb->common; } + if (acb->ioh->cmd_len > SCSI_CDB_MAX_SIZE) { + error_report("iSCSI: ioctl error CDB exceeds max size (%d > %d)", + acb->ioh->cmd_len, SCSI_CDB_MAX_SIZE); + qemu_aio_unref(acb); + return NULL; + } + acb->task = malloc(sizeof(struct scsi_task)); if (acb->task == NULL) { error_report("iSCSI: Failed to allocate task for scsi command. %s",