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Thu, 28 Nov 2019 15:55:06 -0800 (PST) Date: Thu, 28 Nov 2019 15:55:06 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b6b450059870d703@google.com> Subject: KASAN: global-out-of-bounds Read in precalculate_color From: syzbot To: hverkuil-cisco@xs4all.nl, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com, vivek.kasireddy@intel.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: d7688697 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=125118a2e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=121b4285bac421fe dashboard link: https://syzkaller.appspot.com/bug?extid=02d9172bf4c43104cd70 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119c517ae00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+02d9172bf4c43104cd70@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in precalculate_color+0x2154/0x2480 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:942 Read of size 1 at addr ffffffff884787bf by task vivid-000-vid-c/8948 CPU: 1 PID: 8948 Comm: vivid-000-vid-c Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 precalculate_color+0x2154/0x2480 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:942 tpg_precalculate_colors drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:1093 [inline] tpg_recalc+0x561/0x2850 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2118 tpg_calc_text_basep+0xa1/0x290 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2136 vivid_fillbuff+0x1a5f/0x3af0 drivers/media/platform/vivid/vivid-kthread-cap.c:466 vivid_thread_vid_cap_tick+0x8cf/0x2210 drivers/media/platform/vivid/vivid-kthread-cap.c:727 vivid_thread_vid_cap+0x5d8/0xa60 drivers/media/platform/vivid/vivid-kthread-cap.c:866 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the variable: sin+0x17f/0x280 Memory state around the buggy address: ffffffff88478680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff88478700: 00 00 00 00 00 00 00 00 01 fa fa fa fa fa fa fa > ffffffff88478780: 00 00 06 fa fa fa fa fa 04 fa fa fa fa fa fa fa ^ ffffffff88478800: 05 fa fa fa fa fa fa fa 05 fa fa fa fa fa fa fa ffffffff88478880: 00 00 fa fa fa fa fa fa 00 00 00 00 00 00 fa fa ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches