8021q: adding VLAN 0 to HW filter on device batadv0
audit: type=1400 audit(1573763639.893:38): avc:  denied  { associate } for  pid=7659 comm="syz-executor.0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
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BUG: KASAN: stack-out-of-bounds in memset include/linux/string.h:333 [inline]
BUG: KASAN: stack-out-of-bounds in ax25_getname+0x58/0x7a0 net/ax25/af_ax25.c:1408
Write of size 72 at addr ffff88807ae07c78 by task syz-executor.0/7678

CPU: 0 PID: 7678 Comm: syz-executor.0 Not tainted 4.19.84 #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.cold+0x7c/0x20d mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memset+0x24/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:333 [inline]
 ax25_getname+0x58/0x7a0 net/ax25/af_ax25.c:1408
 get_raw_socket drivers/vhost/net.c:1206 [inline]
 get_socket drivers/vhost/net.c:1262 [inline]
 vhost_net_set_backend drivers/vhost/net.c:1297 [inline]
 vhost_net_ioctl+0x120a/0x1900 drivers/vhost/net.c:1488
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
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:00007febeb5c8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000020d7c000 RSI: 000000004008af30 RDI: 0000000000000003
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007febeb5c96d4
R13: 00000000004c56ed R14: 00000000004da738 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0001eb81c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 0000000000000000 ffffffff01eb0101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88807ae07b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
 ffff88807ae07c00: f1 f1 f1 f1 f1 04 f2 00 f2 f2 f2 00 f2 f2 f2 00
>ffff88807ae07c80: 00 00 00 00 00 04 f3 f3 f3 f3 f3 00 00 00 00 00
                                  ^
 ffff88807ae07d00: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffff88807ae07d80: 00 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00
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