Hello,
syzbot found the following crash on:
HEAD commit: 63de3747 Merge tag 'tag-chrome-platform-for-v5.5' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x40fc41e00000
kernel config: https://syzkaller.appspot.com/x/.config?x
189d07c6717979
dashboard link: https://syzkaller.appspot.com/bug?extidåfd3e65515b48c02a30
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: <redacted>
=================================
BUG: KASAN: vmalloc-out-of-bounds in bitfill_aligned
drivers/video/fbdev/core/sysfillrect.c:54 [inline]
BUG: KASAN: vmalloc-out-of-bounds in bitfill_aligned+0x356/0x410
drivers/video/fbdev/core/sysfillrect.c:25
Write of size 8 at addr ffffc90008b11000 by task syz-executor.2/9476
CPU: 2 PID: 9476 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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:638
__asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140
bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:54 [inline]
bitfill_aligned+0x356/0x410 drivers/video/fbdev/core/sysfillrect.c:25
sys_fillrect+0x421/0x7c0 drivers/video/fbdev/core/sysfillrect.c:291
drm_fb_helper_sys_fillrect+0x21/0x190 drivers/gpu/drm/drm_fb_helper.c:736
bit_clear_margins+0x30b/0x530 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1e9/0x250 drivers/video/fbdev/core/fbcon.c:1372
31 more lines
ffffc90008b11000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
^
ffffc90008b11080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
ffffc90008b11100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=================================
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