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bh=o0+SZhoZBty2UalGAt7idgrFE8ZMR/w4RB0biz2xMko=; b=Tojm5grNuSdceLhqVGXeZrCc8f8wR3eaB0EXoLjnzyflhd//1HL2pplNYcAx58ibv4JkPr snoFQAYTFBLWKZcOh+hkJMUczh69oiqKE9ZUhzcI+YV/XI0/1/Ut/jdKB3qd7VZHq9Y3Dp a7OHeW1HqKUgOVcgWIktakFfV/Z6H20= X-MC-Unique: AFZcPvFLNUevx6RglH6f3Q-1 From: Mauro Matteo Cascella To: qemu-devel@nongnu.org Cc: mcascell@redhat.com, pbonzini@redhat.com, fam@euphon.net, thuth@redhat.com Subject: [PATCH] scsi/lsi53c895a: fix use-after-free in lsi_do_msgout (CVE-2022-0216) Date: Tue, 5 Jul 2022 22:05:43 +0200 Message-Id: <20220705200543.2366809-1-mcascell@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=mcascell@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1657051691936100001 Content-Type: text/plain; charset="utf-8" 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 pat= ch. Fixes: CVE-2022-0216 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/972 Signed-off-by: Mauro Matteo Cascella Reviewed-by: Thomas Huth --- 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 c8773f73f7..99ea42d49b 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 =3D NULL; } lsi_disconnect(s); break; --=20 2.35.3