KASAN: user-memory-access Read in do_con

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: user-memory-access Read in do_con_trol serial	17				3	1940d	1939d	0/29	closed as dup on 2020/07/20 22:48
linux-4.19	KASAN: user-memory-access Read in do_con_trol	17				2	1975d	2017d	0/1	auto-closed as invalid on 2020/07/31 00:46

================================================================== BUG: KASAN: user-memory-access in memcpy include/linux/string.h:347 [inline] BUG: KASAN: user-memory-access in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: user-memory-access in delete_char drivers/tty/vt/vt.c:546 [inline] BUG: KASAN: user-memory-access in csi_P drivers/tty/vt/vt.c:1648 [inline] BUG: KASAN: user-memory-access in do_con_trol+0x3188/0x5b40 drivers/tty/vt/vt.c:2022 Read of size 338 at addr 00000000fffffebe by task syz-executor.3/1272 CPU: 1 PID: 1272 Comm: syz-executor.3 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 kasan_report_error mm/kasan/report.c:349 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0x127/0x2af mm/kasan/report.c:393 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 memcpy+0x24/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] delete_char drivers/tty/vt/vt.c:546 [inline] csi_P drivers/tty/vt/vt.c:1648 [inline] do_con_trol+0x3188/0x5b40 drivers/tty/vt/vt.c:2022 do_con_write.part.0+0xcc7/0x1b50 drivers/tty/vt/vt.c:2434 do_con_write drivers/tty/vt/vt.c:2205 [inline] con_write+0x38/0xc0 drivers/tty/vt/vt.c:2787 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x38b/0xf20 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c449 RSP: 002b:00007fe608442c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe6084436d4 RCX: 000000000045c449 RDX: 0000000000000004 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cad R14: 00000000004ce949 R15: 000000000076bf2c ==================================================================