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hw/nvme: fix heap-buffer-overflow in nvme_abort

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In nvme_abort(), the submission queue pointer is dereferenced from the
guest-controlled sqid before validating it with nvme_check_sqid():

    NvmeSQueue *sq = n->sq[sqid];

Since sqid is a 16-bit value (range 0-65535) taken directly from CDW10,
and n->sq[] is typically only max_ioqpairs+1 (65) entries, a malicious
guest can trigger an out-of-bounds heap read by sending an Abort command
with a large sqid.

ASan reports this as heap-buffer-overflow in nvme_abort.

Fix this by moving the array dereference to after the nvme_check_sqid()
bounds validation.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3348
Fixes: 75209c071a ("hw/nvme: actually implement abort")
Cc: qemu-stable@nongnu.org
Signed-off-by: Kaixuan Li <kaixuanli@ntu.edu.sg>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
This commit is contained in:
Kaixuan Li
2026-03-19 10:46:00 +01:00
committed by Klaus Jensen
parent 55720ba97d
commit eb5cc99aff
1 changed files with 3 additions and 1 deletions
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4
hw/nvme/ctrl.c
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@@ -6111,7 +6111,7 @@ static uint16_t nvme_abort(NvmeCtrl *n, NvmeRequest *req)
{
uint16_t sqid = le32_to_cpu(req->cmd.cdw10) & 0xffff;
uint16_t cid = (le32_to_cpu(req->cmd.cdw10) >> 16) & 0xffff;
NvmeSQueue *sq = n->sq[sqid];
NvmeSQueue *sq;
NvmeRequest *r, *next;
int i;
@@ -6120,6 +6120,8 @@ static uint16_t nvme_abort(NvmeCtrl *n, NvmeRequest *req)
return NVME_INVALID_FIELD | NVME_DNR;
}
sq = n->sq[sqid];
if (sqid == 0) {
for (i = 0; i < n->outstanding_aers; i++) {
NvmeRequest *re = n->aer_reqs[i];