================================================================== BUG: KASAN: stack-out-of-bounds in memset include/linux/string.h:365 [inline] BUG: KASAN: stack-out-of-bounds in ax25_getname+0x4d/0x7b0 net/ax25/af_ax25.c:1405 Write of size 72 at addr ffff88808efffc78 by task syz-executor.5/11370 CPU: 0 PID: 11370 Comm: syz-executor.5 Not tainted 5.5.0-rc6-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+0x12d/0x187 lib/dump_stack.c:118 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374 __kasan_report.cold.11+0x1b/0x3a 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+0x153/0x1d0 mm/kasan/generic.c:192 memset+0x23/0x40 mm/kasan/common.c:108 memset include/linux/string.h:365 [inline] ax25_getname+0x4d/0x7b0 net/ax25/af_ax25.c:1405 get_raw_socket drivers/vhost/net.c:1433 [inline] get_socket drivers/vhost/net.c:1489 [inline] vhost_net_set_backend drivers/vhost/net.c:1524 [inline] vhost_net_ioctl+0xe74/0x1530 drivers/vhost/net.c:1715 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbdd8fdec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000020d7c000 RSI: 000000004008af30 RDI: 0000000000000003 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbdd8fdf6d4 R13: 00000000004c5b18 R14: 00000000004dab78 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea00023bffc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 raw: 01fffc0000000000 0000000000000000 ffffffff023b0101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected addr ffff88808efffc78 is located in stack of task syz-executor.5/11370 at offset 160 in frame: vhost_net_ioctl+0x0/0x1530 drivers/vhost/net.c:1245 this frame has 3 objects: [32, 36) 'r' [96, 104) 'backend' [160, 212) 'uaddr' Memory state around the buggy address: ffff88808efffb80: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 ffff88808efffc00: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 >ffff88808efffc80: 00 00 00 00 00 04 f2 00 00 00 00 00 00 00 00 00 ^ ffff88808efffd00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 ffff88808efffd80: f2 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 ==================================================================