linux-kernel - [PATCH] drivers/block/loop: Remove deprecated function, range check for max

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Date:   Tue, 25 Jun 2019 13:40:56 +0200
From:   Florian Knauf <florian.knauf@...d.uni-hannover.de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...cs.fau.de, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Florian Knauf <florian.knauf@...d.uni-hannover.de>,
        Christian Ewert <christian.ewert@...d.uni-hannover.de>
Subject: [PATCH] drivers/block/loop: Remove deprecated function, range check for max_loop

This patch removes the deprecated simple_strtol function from the option
parsing logic in the loopback device driver. It also introduces a range
check for the max_loop parameter to ensure that negative and out-of-range
values (that cannot be represented by int max_loop) are ignored.

Signed-off-by: Florian Knauf <florian.knauf@...d.uni-hannover.de>
Signed-off-by: Christian Ewert <christian.ewert@...d.uni-hannover.de>
---
 drivers/block/loop.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 102d79575895..acdd028ed486 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2289,7 +2289,17 @@ module_exit(loop_exit);
 #ifndef MODULE
 static int __init max_loop_setup(char *str)
 {
-	max_loop = simple_strtol(str, NULL, 0);
+	long max_loop_long = 0;
+
+	/*
+	 * Range check for max_loop: negative values and values not
+	 * representable by int are ignored.
+	 */
+	if (kstrtol(str, 0, &max_loop_long) == 0 &&
+			max_loop_long >= 0 &&
+			max_loop_long <= INT_MAX)
+		max_loop = (int) max_loop_long;
+
 	return 1;
 }
 
-- 
2.17.1