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Wed, 31 May 2023 09:43:56 -0700 (PDT) Received: from localhost.localdomain ([240d:1a:c0d:9f00:ca6:1aff:fead:cef4]) by smtp.gmail.com with ESMTPSA id ik8-20020a170902ab0800b001ae0152d280sm1608192plb.193.2023.05.31.09.43.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 May 2023 09:43:55 -0700 (PDT) From: Shigeru Yoshida To: jejb@linux.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Shigeru Yoshida Subject: [PATCH] scsi: sr: Fix a potential uninit-value in sr_get_events() Date: Thu, 1 Jun 2023 01:43:46 +0900 Message-Id: <20230531164346.118438-1-syoshida@redhat.com> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767429512510429524?= X-GMAIL-MSGID: =?utf-8?q?1767429512510429524?= KMSAN found the following issue: BUG: KMSAN: uninit-value in sr_check_events+0x365/0x1460 sr_check_events+0x365/0x1460 cdrom_check_events+0x66/0x170 sr_block_check_events+0xf2/0x130 disk_check_events+0xec/0x900 bdev_check_media_change+0x2a6/0x7d0 sr_block_open+0x154/0x320 blkdev_get_whole+0xa8/0x6c0 blkdev_get_by_dev+0x50f/0x1200 blkdev_open+0x215/0x430 do_dentry_open+0xfbd/0x19a0 vfs_open+0x7b/0xa0 path_openat+0x4a54/0x5b40 do_filp_open+0x24d/0x660 do_sys_openat2+0x1f0/0x910 __x64_sys_openat+0x2b4/0x330 do_syscall_64+0x41/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Local variable sshdr.i created at: sr_check_events+0x131/0x1460 cdrom_check_events+0x66/0x170 sr_get_events() can access uninitialized local variable sshdr when scsi_execute_cmd() returns error. This patch fixes the issue by checking the result before accessing sshdr. Fixes: 93aae17af117 ("sr: implement sr_check_events()") Signed-off-by: Shigeru Yoshida --- drivers/scsi/sr.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 12869e6d4ebd..86b43c069a44 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -177,10 +177,13 @@ static unsigned int sr_get_events(struct scsi_device *sdev) result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf), SR_TIMEOUT, MAX_RETRIES, &exec_args); + if (result) + return 0; + if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) return DISK_EVENT_MEDIA_CHANGE; - if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) + if (be16_to_cpu(eh->data_len) < sizeof(*med)) return 0; if (eh->nea || eh->notification_class != 0x4)