linux-kernel - [PATCH] Return error code for failure input for sscanf in parse_cblock

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Message-ID: <20240922164702.49615-1-kdipendra88@gmail.com>
Date: Sun, 22 Sep 2024 16:47:01 +0000
From: Dipendra Khadka <kdipendra88@...il.com>
To: agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com
Cc: Dipendra Khadka <kdipendra88@...il.com>,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Return error code for failure input for sscanf in parse_cblock_range()

Smatch reported following:
'''
drivers/md/dm-cache-target.c:3204 parse_cblock_range() warn: sscanf doesn't return error codes
drivers/md/dm-cache-target.c:3217 parse_cblock_range() warn: sscanf doesn't return error codes
'''

Since, the only negative value that is returned by sscanf is -1.
Returning -ENVAL when sscanf returns -1.

Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
---
 drivers/md/dm-cache-target.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 17f0fab1e254..c35d65e310d6 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3200,8 +3200,8 @@ static int parse_cblock_range(struct cache *cache, const char *str,
 	 * Try and parse form (ii) first.
 	 */
 	r = sscanf(str, "%llu-%llu%c", &b, &e, &dummy);
-	if (r < 0)
-		return r;
+	if (r == -1)
+		return -EINVAL;
 
 	if (r == 2) {
 		result->begin = to_cblock(b);
@@ -3213,8 +3213,8 @@ static int parse_cblock_range(struct cache *cache, const char *str,
 	 * That didn't work, try form (i).
 	 */
 	r = sscanf(str, "%llu%c", &b, &dummy);
-	if (r < 0)
-		return r;
+	if (r == -1)
+		return -EINVAL;
 
 	if (r == 1) {
 		result->begin = to_cblock(b);
-- 
2.43.0