From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EB4FC4646B for ; Wed, 26 Jun 2019 06:01:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C6E6208CB for ; Wed, 26 Jun 2019 06:01:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="pmgK/nYZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726708AbfFZGBn (ORCPT ); Wed, 26 Jun 2019 02:01:43 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:42609 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725790AbfFZGBn (ORCPT ); Wed, 26 Jun 2019 02:01:43 -0400 Received: by mail-pf1-f196.google.com with SMTP id q10so725176pff.9; Tue, 25 Jun 2019 23:01:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=ZNJj3CjcDtl0Bgik+fJ5f3lZ9ANWsGTsyVirZdpD8EM=; b=pmgK/nYZHHwueN3F9YBPxm5xyifECKJey/yfzjE2Gd8mHEMvbG6XTT4unYkY61ty6c nRpXey5cPqMP6VVziojFmH12+fcaNYggm6BtEvCMXC5oMTMUo+pFtio9Y4HlWnZUckTu 8MvVewalXLEDjTXlluB/19ynW6j+NpHG9HbC0OCkiresxZpEh3jQ1q9nuxUsKiPxrxMy HMShFYjbnWWmhF7Izzy4KNbDL5rcGVPBOp+c3J7PyuFr+M+xeoDT3JnBYkHQ+Bd596gw fp47zoxDGfWXpqVG8Q3fFZ+TbA1JRZhyrsiAAQpJQhaTkiparHTCLsAWbrLGUZJg4ugf tBqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=ZNJj3CjcDtl0Bgik+fJ5f3lZ9ANWsGTsyVirZdpD8EM=; b=QSCa0q7zeCX5CIZirbLA7Fs4EbgT8QkwgqnrFcWPe+Av7BlkKAVspLpg4WeyNp2GaK Ljs4FIIQdZ/cNiLjwYvTRfJwwsfKagInXiugTLVi4Du26rcmPioXkLe9BKYHp+Yhr2I9 I3MYqmijQLj3iQff4L9zaujZBCdviCRfm/aXdGgrOQWC17o2tiYXebhF969PQsW+ddbf AQag9Z0nOG67Kf5U6gARSzk8r0i6RR+WaAwJcYQo+XM/g2hVQ/OgFlfeNrYK0aaAvQFu HU1ZSb+muMxwYNnpiBFk31QppxcX2pH8YZLh1DMRIkBct2cOdxgcIwQGrKHqHTPm3Stc /jWg== X-Gm-Message-State: APjAAAXY2rktPb1H2LpOtzJFecvQUe8WC3E6lWKxV9aazm7wZN+E0/Uz DHgNVTm9ZUvvMxvjN/eJTQI= X-Google-Smtp-Source: APXvYqwGZ1aPeO54Ny4sGR2KuzZc9jJTzUSmbycQV3iHl/HnQP6K5zI8tw8GlVVrWZUMXEJhQqRHOw== X-Received: by 2002:a63:1657:: with SMTP id 23mr1129946pgw.98.1561528902301; Tue, 25 Jun 2019 23:01:42 -0700 (PDT) Received: from bnva-HP-Pavilion-g6-Notebook-PC.domain.name ([117.241.200.186]) by smtp.gmail.com with ESMTPSA id k22sm17156025pfk.157.2019.06.25.23.01.39 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 25 Jun 2019 23:01:41 -0700 (PDT) From: Vandana BN To: Hans Verkuil , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: skhan@linuxfoundation.org, gregkh@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, Vandana BN Subject: [PATCH] media:vivid: add sanity check to avoid divide error and set value to 1 if 0. Date: Wed, 26 Jun 2019 11:31:15 +0530 Message-Id: <20190626060115.4305-1-bnvandana@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Syzbot reported divide error in vivid_thread_vid_cap, which has been seen only once and doesnot have a reproducer. This patch sanity checks for the denominator value with WARN_ON if it is 0 and replaces it with 1. Reported-by: syz...@syzkaller.appspotmail.com divide error: 0000 [#1] PREEMPT SMP KASAN kobject: 'tx-0' (0000000017161f7f): kobject_uevent_env CPU: 0 PID: 23689 Comm: vivid-003-vid-c Not tainted 5.0.0-rc4+ #58 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vivid_cap_update_frame_period drivers/media/platform/vivid/vivid-kthread-cap.c:661 [inline] RIP: 0010:vivid_thread_vid_cap+0x221/0x284 drivers/media/platform/vivid/vivid-kthread-cap.c:789 Code: 48 c1 e9 03 0f b6 0c 11 48 89 f2 48 69 c0 00 ca 9a 3b 83 c2 03 38 ca 7c 08 84 c9 0f 85 f0 1e 00 00 41 8b 8f 24 64 00 00 31 d2 <48> f7 f1 49 89 c4 48 89 c3 49 8d 87 28 64 00 00 48 89 c2 48 89 45 RSP: 0018:ffff88808b4afd68 EFLAGS: 00010246 kobject: 'tx-0' (0000000017161f7f): fill_kobj_path: path = '/devices/virtual/net/gre0/queues/tx-0' RAX: 000000de5a6f8e00 RBX: 0000000100047b22 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: ffff88808b4aff00 R08: ffff88804862e1c0 R09: ffffffff89997008 R10: ffffffff89997010 R11: 0000000000000001 R12: 00000000fffffffc R13: ffff8880a17e0500 R14: ffff88803e40f760 R15: ffff8882182b0140 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004cdc90 CR3: 000000005d827000 CR4: 00000000001426f0 Call Trace: kobject: 'gretap0' (00000000d7549098): kobject_add_internal: parent: 'net', set: 'devices' kobject: 'loop2' (0000000094ed4ee4): kobject_uevent_env kobject: 'loop2' (0000000094ed4ee4): fill_kobj_path: path = '/devices/virtual/block/loop2' kthread+0x357/0x430 kernel/kthread.c:246 kobject: 'gretap0' (00000000d7549098): kobject_uevent_env ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Modules linked in: kobject: 'gretap0' (00000000d7549098): fill_kobj_path: path = '/devices/virtual/net/gretap0' ---[ end trace bc5c8b25b64d768f ]--- kobject: 'loop1' (0000000032036b86): kobject_uevent_env RIP: 0010:vivid_cap_update_frame_period drivers/media/platform/vivid/vivid-kthread-cap.c:661 [inline] RIP: 0010:vivid_thread_vid_cap+0x221/0x2840 drivers/media/platform/vivid/vivid-kthread-cap.c:789 kobject: 'loop1' (0000000032036b86): fill_kobj_path: path = '/devices/virtual/block/loop1' Code: 48 c1 e9 03 0f b6 0c 11 48 89 f2 48 69 c0 00 ca 9a 3b 83 c2 03 38 ca 7c 08 84 c9 0f 85 f0 1e 00 00 41 8b 8f 24 64 00 00 31 d2 <48> f7 f1 49 89 c4 48 89 c3 49 8d 87 28 64 00 00 48 89 c2 48 89 45 kobject: 'loop0' (00000000dd9927c3): kobject_uevent_env RSP: 0018:ffff88808b4afd68 EFLAGS: 00010246 RAX: 000000de5a6f8e00 RBX: 0000000100047b22 RCX: 0000000000000000 kobject: 'queues' (000000007ed20666): kobject_add_internal: parent: 'gretap0', set: '' RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: ffff88808b4aff00 R08: ffff88804862e1c0 R09: ffffffff89997008 kobject: 'loop0' (00000000dd9927c3): fill_kobj_path: path = '/devices/virtual/block/loop0' R10: ffffffff89997010 R11: 0000000000000001 R12: 00000000fffffffc kobject: 'queues' (000000007ed20666): kobject_uevent_env R13: ffff8880a17e0500 R14: ffff88803e40f760 R15: ffff8882182b0140 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 kobject: 'loop5' (00000000a41f9e79): kobject_uevent_env CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'queues' (000000007ed20666): kobject_uevent_env: filter function caused the event to drop! CR2: 00000000004cdc90 CR3: 000000005d827000 CR4: 00000000001426f0 kobject: 'loop5' (00000000a41f9e79): fill_kobj_path: path = '/devices/virtual/block/loop5' Signed-off-by: Vandana BN --- drivers/media/platform/vivid/vivid-kthread-cap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/platform/vivid/vivid-kthread-cap.c b/drivers/media/platform/vivid/vivid-kthread-cap.c index f8006a30c12f..025a8c68bd1c 100644 --- a/drivers/media/platform/vivid/vivid-kthread-cap.c +++ b/drivers/media/platform/vivid/vivid-kthread-cap.c @@ -658,6 +658,8 @@ static void vivid_cap_update_frame_period(struct vivid_dev *dev) u64 f_period; f_period = (u64)dev->timeperframe_vid_cap.numerator * 1000000000; + if(WARN_ON(dev->timeperframe_vid_cap.denominator == 0)) + dev->timeperframe_vid_cap.denominator = 1; do_div(f_period, dev->timeperframe_vid_cap.denominator); if (dev->field_cap == V4L2_FIELD_ALTERNATE) f_period >>= 1; -- 2.17.1