From 6c8fa961da5e60f574bb52fd3ad44b1e9e8ad4b8 Mon Sep 17 00:00:00 2001 From: Mauro Matteo Cascella Date: Tue, 5 Jul 2022 22:05:43 +0200 Subject: scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216) 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 Reviewed-by: Thomas Huth Message-Id: <20220705200543.2366809-1-mcascell@redhat.com> Signed-off-by: Paolo Bonzini --- hw/scsi/lsi53c895a.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index c8773f7..99ea42d 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -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; -- cgit v1.1