linux-kernel - [scsi 5/7 RESEND] scsi_debug: schedule

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1438091666-18113-5-git-send-email-tomas.winkler@intel.com>
Date:	Tue, 28 Jul 2015 16:54:24 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Christoph Hellwig <hch@....de>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>,
	Douglas Gilbert <dgilbert@...erlog.com>
Subject: [scsi 5/7 RESEND] scsi_debug: schedule_resp fix input variable check

The function should never be called with cmnd NULL so
put a fat WARN there.
Fix also smatch wraning:
schedule_resp() warn: variable dereferenced before check 'cmnd'

Cc: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
---
 drivers/scsi/scsi_debug.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 3a70683cf9f9..faa4ddd8decf 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -3941,13 +3941,20 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
 	unsigned long iflags;
 	int k, num_in_q, qdepth, inject;
 	struct sdebug_queued_cmd *sqcp = NULL;
-	struct scsi_device *sdp = cmnd->device;
+	struct scsi_device *sdp;
+
+	/* this should never happen */
+	if (WARN_ON(!cmnd))
+		return SCSI_MLQUEUE_HOST_BUSY;
 
-	if (NULL == cmnd || NULL == devip) {
-		pr_warn("called with NULL cmnd or devip pointer\n");
+	if (NULL == devip) {
+		pr_warn("called devip == NULL\n");
 		/* no particularly good error to report back */
 		return SCSI_MLQUEUE_HOST_BUSY;
 	}
+
+	sdp = cmnd->device;
+
 	if ((scsi_result) && (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
 		sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
 			    __func__, scsi_result);
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/