================================================================== BUG: KASAN: stack-out-of-bounds in memset include/linux/string.h:363 [inline] BUG: KASAN: stack-out-of-bounds in ax25_getname+0x58/0x7a0 net/ax25/af_ax25.c:1405 Write of size 72 at addr ffff8880949efc78 by task syz-executor.0/9272 CPU: 1 PID: 9272 Comm: syz-executor.0 Not tainted 5.4.0-rc7+ #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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memset+0x24/0x40 mm/kasan/common.c:105 memset include/linux/string.h:363 [inline] ax25_getname+0x58/0x7a0 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+0x120a/0x1960 drivers/vhost/net.c:1715 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a669 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:00007f2d69016c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a669 RDX: 0000000020d7c000 RSI: 000000004008af30 RDI: 0000000000000003 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d690176d4 R13: 00000000004c5b58 R14: 00000000004dabb8 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea0002527bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x1fffc0000000000() raw: 01fffc0000000000 0000000000000000 ffffffff02520101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected addr ffff8880949efc78 is located in stack of task syz-executor.0/9272 at offset 128 in frame: vhost_net_ioctl+0x0/0x1960 drivers/vhost/net.c:386 this frame has 4 objects: [48, 52) 'r' [64, 72) 'features' [96, 104) 'backend' [128, 180) 'uaddr' Memory state around the buggy address: ffff8880949efb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 ffff8880949efc00: f1 f1 f1 f1 f1 04 f2 00 f2 f2 f2 00 f2 f2 f2 00 >ffff8880949efc80: 00 00 00 00 00 04 f3 f3 f3 f3 f3 00 00 00 00 00 ^ ffff8880949efd00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 ffff8880949efd80: 00 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 ==================================================================