Messages in this thread | | | Date | Thu, 28 Nov 2019 15:55:06 -0800 | Subject | KASAN: global-out-of-bounds Read in precalculate_color | From | syzbot <> |
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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 ==================================================================
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