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@xxxxxxxxxxxxxxxxxxxxxxxxx
==================================================================
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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