linux-kernel - [PATCH] block: Fix implicit unsigned to signed conversion

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Date:   Wed, 18 Sep 2019 11:38:28 +0100
From:   Alessio Balsini <balsini@...roid.com>
To:     linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Alessio Balsini <balsini@...roid.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH] block: Fix implicit unsigned to signed conversion

An unsigned integer variable may be assigned negative values, and is
returned by the function with an implicit conversion to signed.  Besides
the implicit conversion at return time for which the variable
representation is fine and there is no variable manipulation that may
lead to bugs in the current code base, this is a conceptual error.

Fix by changing the variable type from unsigned to signed.

Signed-off-by: Alessio Balsini <balsini@...roid.com>
Cc: Jens Axboe <axboe@...nel.dk>
---
 block/blk-settings.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 6bd1e3b082d8..c76c25c45869 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -496,7 +496,8 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
 int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 		     sector_t start)
 {
-	unsigned int top, bottom, alignment, ret = 0;
+	unsigned int top, bottom, alignment;
+	int ret = 0;
 
 	t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
 	t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);
-- 
2.23.0.237.gc6a4ce50a0-goog