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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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=2600:3c04:e001:324:0:1991:8:25; envelope-from=deller@kernel.org; helo=tor.source.kernel.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1766505086741158500 Content-Type: text/plain; charset="utf-8" From: Soumyajyotii Ssarkar Add nullpointer safety checks in ncr710_request_free() and ncr710_request_cancelled() to prevent crashed while handing invalid req structures. Added to preventing memory corruption, which occured during device initialization. Signed-off-by: Soumyajyotii Ssarkar Reviewed-by: Helge Deller Signed-off-by: Helge Deller --- hw/scsi/ncr53c710.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/hw/scsi/ncr53c710.c b/hw/scsi/ncr53c710.c index 47a6983491..bab2ea7210 100644 --- a/hw/scsi/ncr53c710.c +++ b/hw/scsi/ncr53c710.c @@ -737,6 +737,12 @@ static void ncr710_add_msg_byte(NCR710State *s, uint8_= t data) =20 static void ncr710_request_free(NCR710State *s, NCR710Request *p) { + if (!p) { + return; + } + if (p->req && p->req->hba_private =3D=3D p) { + p->req->hba_private =3D NULL; + } if (p =3D=3D s->current) { s->current =3D NULL; } @@ -747,8 +753,11 @@ void ncr710_request_cancelled(SCSIRequest *req) { NCR710State *s =3D ncr710_from_scsi_bus(req->bus); NCR710Request *p =3D (NCR710Request *)req->hba_private; - req->hba_private =3D NULL; - ncr710_request_free(s, p); + if (p) { + req->hba_private =3D NULL; + p->req =3D NULL; + ncr710_request_free(s, p); + } scsi_req_unref(req); } =20 --=20 2.52.0