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scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216)

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Set current_req->req to NULL to prevent reusing a free'd buffer in case of
repeated SCSI cancel requests. Thanks to Thomas Huth for suggesting the patch.

Fixes: CVE-2022-0216
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/972
Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220705200543.2366809-1-mcascell@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Mauro Matteo Cascella 2022-07-05 22:05:43 +02:00 committed by Paolo Bonzini
parent 170ed475cd
commit 6c8fa961da
1 changed files with 2 additions and 1 deletions
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3
hw/scsi/lsi53c895a.c
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@ -1028,8 +1028,9 @@ static void lsi_do_msgout(LSIState *s)
case 0x0d:
/* The ABORT TAG message clears the current I/O process only. */
trace_lsi_do_msgout_abort(current_tag);
if (current_req) {
if (current_req && current_req->req) {
scsi_req_cancel(current_req->req);
current_req->req = NULL;
}
lsi_disconnect(s);
break;