From: syzbot <syzbot+3e16980543e238b95bd1@syzkaller.appspotmail.com>
To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Forwarded: [PATCH] dm cache: fix divide error in too_many_discard_blocks
Date: Fri, 06 Nov 2026 11:21:58 -0800 [thread overview]
Message-ID: <6aee28d6.4bd0a7c9.1b4322.0000.GAE@google.com> (raw)
In-Reply-To: <6aedf353.8be4ead1.3b45e1.017d.GAE@google.com>
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***
Subject: [PATCH] dm cache: fix divide error in too_many_discard_blocks
Author: drifabdelmalekmohamedsaid@gmail.com
#syz test
Signed-off-by: Drif Abdelmalek Mohamed Said <drifabdelmalekmohamedsaid@gmail.com>
---
drivers/md/dm-cache-target.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1a5072425c4a..408bc743a141 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2383,6 +2383,8 @@ 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)
{
+ if (discard_block_size > U32 / 2)
+ return false;
(void) sector_div(origin_size, discard_block_size);
return origin_size > MAX_DISCARD_BLOCKS;
--
2.47.3
prev parent reply other threads:[~2026-11-06 19:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-06 15:33 [syzbot] [dm?] divide error in cache_ctr syzbot
2026-11-06 19:21 ` syzbot [this message]
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