From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.210.69 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793992920; b=d3gUBpZ01nKS9zq930uh/9Nbt/2u2Ck5vibUiiMsjy5oBINoXIAinMWEk9ORjKCiTsqy Fb078hZSSGaSF1buiMKtAi9O8vaj41jXGyVVMLHt6qe8eCCSECsa95FBv85F2Pp6HKrQH Uy4nDVbNDo5K5VUvoZYTjy89wvM+W+F3VzdezJXUcnSuz+mfWoG2tFaegu+seBPjNVRIx N0mw2mANTpB/hGACOrve0NXLFUdsty3ffKvDw2VOwFI78OmJehpFyVaAKLrHVGbQDEI+p h54yQrDWHVTc07lLYZHdXLv8XEbOpVthaCgROqaICh/iXlyYE6knozFYfXlzggwbRbA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793992920; h=DMARC-Filter:Received:X-Google-DKIM-Signature:X-Gm-Message-State: MIME-Version:X-Received:Date:In-Reply-To:X-Google-Appengine-App-Id: X-Google-Appengine-App-Id-Alias:Message-ID:Subject:From:To: Content-Type; bh=41ONaHYp38jSOJh3oEijkJj63g/T8bl6GnT7VMebd6Q=; b=axKtI3oYBjXHwTAShpAiFSwiY85tSiVeMsf8cCZTGbzLtSfPEE8LuWoSzFySB7usbEHH 6i7ugJLxa0UNtenTiQzzcBMZe8VRt53wNZOlST16CKz0wHXcYI6T/YnyBHB/S37om+Rt+ OJgy09MAD3GgHrq7/tKIW7ETzYRyzyjPkbn8eCUrwFr5vnLAiXthuFDeopkViighw0IoP F1oETLBeHQNSQibtaEClkAhIUOVqcW7O2vBV26Q/Q6lwvT6oq+22u/4tcABXFqHratZRG eI/UTcaDxuBVheP7w1SARt6KWuzZ7kuVlG6czSUcFgqWKWYTb0j0jLtLbZFYcYuNkXg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.remote-ip=209.85.210.69 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7760606A326 for ; Fri, 6 Nov 2026 19:21:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org B7760606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f69.google.com with SMTP id 46e09a7af769-8490a7d657cso1314991a34.0 for ; Fri, 06 Nov 2026 11:21:59 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793992918; x=1794597718; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=41ONaHYp38jSOJh3oEijkJj63g/T8bl6GnT7VMebd6Q=; b=thnAg7Z0TTz3ed49ZdlGDJjQ2EnHDSZVgH/6fdRmho2+JwNuAPniRkeRVLztSc1UGs uJezxnYTuy2fL+ZKSIWAIm25rNqPxY2bbI0LW73FRrm8LEHhDOTTRoniv7THAOSqm9pW IuNQESDSMtO06RBnj6mQkL8nHy5D+G3urgK+B0no39xn7ZYquC6OrmXhCordVjvdHnp7 eYfRmNG3NXUeH8p5f63PVtlpxj387bvKH0AOfGqJ7OfqDlaeIhkvSMeeeN1pW9w9mzYD rhf2+0yVRc6AYQTmCwsJfs5AnZZp/WxXXtLnUl55OKfhxVFqACWeHd1pSCwjfVhJG/pG GcWA== X-Gm-Message-State: APuU4Z9/oN2SWfGKcx8fmMREuIFC9FDlfM3PMDxw9RzpiBJ+x1y/K7VB wzQ9RBMehdNjwmoNYcNhv1tCoaoNM+9fyOR3KAgwGa6Uqp3Thcjwzu/tlRzWskgaHI1l/gZ7/tt YrnkW3hSrLu/xxIW841enHZDjm1haqmukK7x765EhlX6GedMONSugfhy97E4= 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 X-Received: by 2002:a05:6808:c1ad:b0:4b2:8ee8:8a38 with SMTP id 5614622812f47-567e095e8c3mr2396413b6e.0.1793992918729; Fri, 06 Nov 2026 11:21:58 -0800 (PST) Date: Fri, 06 Nov 2026 11:21:58 -0800 In-Reply-To: <6aedf353.8be4ead1.3b45e1.017d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aee28d6.4bd0a7c9.1b4322.0000.GAE@google.com> Subject: Forwarded: [PATCH] dm cache: fix divide error in too_many_discard_blocks From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** 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 --- 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