Messages in this thread | | | Date | Mon, 23 Dec 2019 09:31:08 -0800 | Subject | KASAN: vmalloc-out-of-bounds Write in drm_fb_helper_dirty_work | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 62104694 Merge branch 'parisc-5.5-2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1711b6c1e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=1b59a3066828ac4c dashboard link: https://syzkaller.appspot.com/bug?extid=fd418471717e1e1aa783 compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386
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: syzbot+fd418471717e1e1aa783@syzkaller.appspotmail.com
================================================================== BUG: KASAN: vmalloc-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: vmalloc-out-of-bounds in drm_fb_helper_dirty_blit_real drivers/gpu/drm/drm_fb_helper.c:399 [inline] BUG: KASAN: vmalloc-out-of-bounds in drm_fb_helper_dirty_work+0x44c/0x780 drivers/gpu/drm/drm_fb_helper.c:428 Write of size 4064 at addr ffffc9000adea020 by task kworker/2:2/8685
CPU: 2 PID: 8685 Comm: kworker/2:2 Not tainted 5.5.0-rc2-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Workqueue: events drm_fb_helper_dirty_work 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:639 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x38/0x50 mm/kasan/common.c:126 memcpy include/linux/string.h:380 [inline] drm_fb_helper_dirty_blit_real drivers/gpu/drm/drm_fb_helper.c:399 [inline] drm_fb_helper_dirty_work+0x44c/0x780 drivers/gpu/drm/drm_fb_helper.c:428 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Memory state around the buggy address: ffffc9000ade9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000ade9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffffc9000adea000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ^ ffffc9000adea080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ffffc9000adea100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ==================================================================
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