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Fri, 25 Sep 2026 04:48:22 +0000 (GMT) Received: from li-4c4c4544-0054-3910-8039-c3c04f423534.ibm.com.com (unknown [9.61.142.241]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 25 Sep 2026 04:48:22 +0000 (GMT) From: Tyrel Datwyler To: james.bottomley@hansenpartnership.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, brking@linux.ibm.com, davemarq@linux.ibm.com, Tyrel Datwyler Subject: [PATCH v11 03/11] scsi: ibmvfc: fix potential NULL pointer dereference on failed queue allocation Date: Thu, 24 Sep 2026 21:48:52 -0700 Message-ID: <20260925044900.414340-4-tyreld@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260925044900.414340-1-tyreld@linux.ibm.com> References: <20260925044900.414340-1-tyreld@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: AGuLjM2lwAWBFp4rINdpnm81ljR8xn07 X-Authority-Analysis: v=2.4 cv=I43w19gg c=1 sm=1 tr=0 ts=6ab5fd19 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=FYxBZ7uDKvT38RkufYwA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI1MDAxOCBTYWx0ZWRfX2R7uihcWRROP rgubU3qBJBIWvmxMY4wbKbQgFuZvmOkwV28FoipmruAACYA6POAx2pHonUlZJPWwizoHb/W87X2 pxh0AjnbuPSegxP1NyTXheq4Sb3BiW4Jt5GeskuM5RAbGbTF5vDD44kFhFBFscXT8Zksk4gbNLj WJd3ynYUlufLTpq+CJO1wRvHVjrv96x7hgyOoiDPlB5CT5vyrs0TqbldjK9NkpQNW+kNK/2EDXE tfbFXs9BBhrC5eS8sC3nGgWPuJuzcjiavH2Sbe/Cn9p6I/THbDt3bRjo283ZdNulEC8ihYgHYYz oTo1vhwPSTeA0mHbGDStzGblP0R9fqEjsf43wrlCZl8JLSD2nl2E/vvnUN+aWRfVL1qwTh4ejgf W5zyz5HAd9q02RPe/2pL8eSrIlTQPd5mifziRr95jh6qrgtKynQBPg09pyvo4xUzsm4iNu+SBQS 6KYRBpi9GPKaER9RU7Q== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI1MDAxOCBTYWx0ZWRfX4uNEkhv9Obf+ Dkl+z6okshNs3uXlGnEDwXEnQNL5rlsUBZNDvZIUZehBuJoAYw6WJh2rQoxZOlz1mPGRk/1IRDi 4iFsBH6KkkNFemfJygTXVQK4hXHkPx0= X-Proofpoint-GUID: AGuLjM2lwAWBFp4rINdpnm81ljR8xn07 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-25_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 adultscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609250018 Guard the memset() in ibmvfc_deregister_channel() behind a check of scrq->msgs.handle to prevent a NULL dereference when the function is called on a queue that was never allocated, such as async_sub_crq when multi-queue is disabled or initialization failed before ibmvfc_alloc_queue() was reached. Signed-off-by: Dave Marquardt Signed-off-by: Tyrel Datwyler --- drivers/scsi/ibmvscsi/ibmvfc-core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvfc-core.c b/drivers/scsi/ibmvscsi/ibmvfc-core.c index 17c49a0ed4f4..ef76f8c194eb 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc-core.c +++ b/drivers/scsi/ibmvscsi/ibmvfc-core.c @@ -6481,8 +6481,10 @@ static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost, dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc); /* Clean out the queue */ - memset(scrq->msgs.crq, 0, PAGE_SIZE); - scrq->cur = 0; + if (scrq->msgs.handle) { + memset(scrq->msgs.crq, 0, PAGE_SIZE); + scrq->cur = 0; + } LEAVE; } -- 2.55.0