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Fri, 06 Nov 2026 10:10:33 -0800 (PST) Received: from DESKTOP-IR7J1S9.localdomain ([105.99.148.33]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-492d6d6385fsm4790715f8f.16.2026.11.06.10.10.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 10:10:33 -0800 (PST) From: Drif Abdelmalek Mohamed Said 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 Subject: [PATCH] dm cache: fix divide error in too_many_discard_blocks() Date: Fri, 6 Nov 2026 19:10:31 +0100 Message-ID: <20261106181031.1446-1-drifabdelmalekmohamedsaid@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #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