batman_adv: batadv0: Interface deactivated: batadv_slave_0
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BUG: KASAN: slab-out-of-bounds in ieee80211_add_virtual_monitor+0xa42/0xce0 net/mac80211/iface.c:1255
Read of size 1 at addr ffff888051837d50 by task syz.0.2792/14213

CPU: 0 UID: 0 PID: 14213 Comm: syz.0.2792 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 ieee80211_add_virtual_monitor+0xa42/0xce0 net/mac80211/iface.c:1255
 ieee80211_do_stop+0x1786/0x1f70 net/mac80211/iface.c:746
 ieee80211_stop+0x1b1/0x240 net/mac80211/iface.c:828
 __dev_close_many+0x344/0x6b0 net/core/dev.c:1756
 __dev_close net/core/dev.c:1768 [inline]
 __dev_change_flags+0x2be/0x680 net/core/dev.c:9732
 netif_change_flags+0x88/0x1a0 net/core/dev.c:9797
 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3158
 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3944 [inline]
 rtnl_newlink+0x14b0/0x1c90 net/core/rtnetlink.c:4072
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x820 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde6438f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde6527c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fde645e5fa0 RCX: 00007fde6438f749
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007fde64413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde645e6038 R14: 00007fde645e5fa0 R15: 00007ffff300c2c8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880518363c0 pfn:0x51834
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880203b5482
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f8(unknown)
raw: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
raw: ffff8880518363c0 0000000000000000 00000000f8000000 ffff8880203b5482
head: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
head: ffff8880518363c0 0000000000000000 00000000f8000000 ffff8880203b5482
head: 00fff00000000002 ffffea0001460d01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x446dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP), pid 9375, tgid 9374 (syz.0.1016), ts 238768387453, free_ts 222526590617
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 ___kmalloc_large_node+0x4e/0x150 mm/slub.c:5593
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5624
 __do_kmalloc_node mm/slub.c:5640 [inline]
 __kvmalloc_node_noprof+0x6e/0x920 mm/slub.c:7129
 alloc_netdev_mqs+0xa6/0x11b0 net/core/dev.c:11997
 ieee80211_if_add+0x45c/0x1370 net/mac80211/iface.c:2227
 ieee80211_add_iface+0xb5/0x5a0 net/mac80211/cfg.c:217
 rdev_add_virtual_intf net/wireless/rdev-ops.h:50 [inline]
 _nl80211_new_interface net/wireless/nl80211.c:4706 [inline]
 nl80211_new_interface+0x883/0x1130 net/wireless/nl80211.c:4764
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
page last free pid 5824 tgid 5824 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
 __slab_free+0x21b/0x2a0 mm/slub.c:5999
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4948 [inline]
 slab_alloc_node mm/slub.c:5258 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5265
 getname_flags+0xb8/0x540 fs/namei.c:146
 getname include/linux/fs.h:2498 [inline]
 __do_sys_unlink fs/namei.c:5474 [inline]
 __se_sys_unlink fs/namei.c:5472 [inline]
 __x64_sys_unlink+0x3a/0x50 fs/namei.c:5472
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888051837c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff888051837c80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff888051837d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                                 ^
 ffff888051837d80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff888051837e00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
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