From: Drif Abdelmalek Mohamed Said <drifabdelmalekmohamedsaid@gmail.com>
To: syzbot+3e16980543e238b95bd1@syzkaller.appspotmail.com
Cc: syzbot+7ff3adde89dd795ad4c4@syzkaller.appspotmail.com,
kmsan-dev@googlegroups.com, glider@google.com,
dvyukov@google.com, jack@suse.cz, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org,
Drif Abdelmalek Mohamed Said
<drifabdelmalekmohamedsaid@gmail.com>
Subject: [PATCH] dm cache: fix divide error in too_many_discard_blocks()
Date: Fri, 6 Nov 2026 19:10:31 +0100 [thread overview]
Message-ID: <20261106181031.1446-1-drifabdelmalekmohamedsaid@gmail.com> (raw)
#syz test
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1a5072425c4a..2d40d6047ef1 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2383,9 +2383,7 @@ static int create_cache_policy(struct cache *cache, struct cache_args *ca,
static bool too_many_discard_blocks(sector_t discard_block_size,
sector_t origin_size)
{
- (void) sector_div(origin_size, discard_block_size);
-
- return origin_size > MAX_DISCARD_BLOCKS;
+ return div64_u64(origin_size, discard_block_size) > MAX_DISCARD_BLOCKS;
}
static sector_t calculate_discard_block_size(sector_t cache_block_size,
--
2.43.0
next reply other threads:[~2026-11-06 18:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-06 18:10 Drif Abdelmalek Mohamed Said [this message]
2026-11-06 18:10 ` syzbot
2026-11-06 18:10 ` syzbot
-- strict thread matches above, loose matches on Subject: below --
2026-11-06 18:08 Drif Abdelmalek Mohamed Said
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