================================================================== BUG: KASAN: use-after-free in strlen+0x79/0x90 lib/string.c:525 Read of size 1 at addr ffff8881d68adeb8 by task syz-executor356/3108 CPU: 0 PID: 3108 Comm: syz-executor356 Not tainted 5.3.0-rc2+ #25 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+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x6a/0x32c mm/kasan/report.c:351 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 kasan_report+0xe/0x12 mm/kasan/common.c:612 strlen+0x79/0x90 lib/string.c:525 strlen include/linux/string.h:281 [inline] hidraw_ioctl+0x62b/0xae0 drivers/hid/hidraw.c:437 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447139 Code: e8 dc e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc0756e1c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000447139 RDX: 0000000000000000 RSI: 0000000080404804 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000004aab7f R09: 00000000004aab7f R10: 000000000000000b R11: 0000000000000246 R12: 0000000000000019 R13: 00000000004042b0 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea00075a2b40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x200000000000000() raw: 0200000000000000 0000000000000000 ffffffff07130201 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d68add80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881d68ade00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881d68ade80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881d68adf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881d68adf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================