linux-kernel - [PATCH][next] scsi: scsi_debug: Fix addition of uninitialized variable len

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Message-ID: <20250225161324.184873-1-colin.i.king@gmail.com>
Date: Tue, 25 Feb 2025 16:13:24 +0000
From: Colin Ian King <colin.i.king@...il.com>
To: "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Kai Mäkisara <Kai.Makisara@...umbus.fi>,
	John Meneghini <jmeneghi@...hat.com>,
	linux-scsi@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH][next] scsi: scsi_debug: Fix addition of uninitialized variable len

There is an addition on a previously uninitialized variable len that
results in an undefined result. Fix this by making the addition an
assignment. Issue detected with static analysis.

Fixes: 568354b24c7d ("scsi: scsi_debug: Add compression mode page for tapes")

Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 drivers/scsi/scsi_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 722ee8c067ae..f3e9a63bbf02 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -3032,7 +3032,7 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	case 0xf:	/* Compression Mode Page (tape) */
 		if (!is_tape)
 			goto bad_pcode;
-		len += resp_compression_m_pg(ap, pcontrol, target, devip->tape_dce);
+		len = resp_compression_m_pg(ap, pcontrol, target, devip->tape_dce);
 		offset += len;
 		break;
 	case 0x11:	/* Partition Mode Page (tape) */
-- 
2.47.2