linux-kernel - [PATCH] usb: storage: initialize variable

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Message-Id: <20200822211839.5117-1-trix@redhat.com>
Date:   Sat, 22 Aug 2020 14:18:39 -0700
From:   trix@...hat.com
To:     stern@...land.harvard.edu, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] usb: storage: initialize variable

From: Tom Rix <trix@...hat.com>

clang static analysis reports this representative problem

transport.c:495:15: warning: Assigned value is garbage or
  undefined
        length_left -= partial;
                   ^  ~~~~~~~
partial is set only when usb_stor_bulk_transfer_sglist()
is successful.

So initialize to partial to 0.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/usb/storage/transport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index 238a8088e17f..ce920851b1f2 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -461,7 +461,7 @@ static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
 int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
 		      struct scsi_cmnd* srb)
 {
-	unsigned int partial;
+	unsigned int partial = 0;
 	int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb),
 				      scsi_sg_count(srb), scsi_bufflen(srb),
 				      &partial);
@@ -484,7 +484,7 @@ int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe,
 		void *buf, unsigned int length_left, int use_sg, int *residual)
 {
 	int result;
-	unsigned int partial;
+	unsigned int partial = 0;
 
 	/* are we scatter-gathering? */
 	if (use_sg) {
-- 
2.18.1