Message-ID: <69198244.a70a0220.3124cb.0074.GAE@google.com>
Date: Sat, 15 Nov 2025 23:50:28 -0800
From: syzbot <syzbot+bc1aabf52d0a31e91f96@...kaller.appspotmail.com>
To: johannes@...solutions.net, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [wireless?] KASAN: slab-out-of-bounds Read in ieee80211_add_virtual_monitor

Hello,

syzbot found the following issue on:

HEAD commit:    04ca7a69a35b net: bnx2x: convert to use get_rx_ring_count
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1330a914580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4dda49799a90cd0f
dashboard link: https://syzkaller.appspot.com/bug?extid=bc1aabf52d0a31e91f96
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fe2c1ac0be7e/disk-04ca7a69.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b6c6a173a173/vmlinux-04ca7a69.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8a163d4feba0/bzImage-04ca7a69.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bc1aabf52d0a31e91f96@...kaller.appspotmail.com

tipc: Resetting bearer <eth:syzkaller0>
==================================================================
BUG: KASAN: slab-out-of-bounds in ieee80211_add_virtual_monitor+0xa52/0xd00 net/mac80211/iface.c:1255
Read of size 1 at addr ffff888047b63d50 by task syz.3.4250/20835

CPU: 0 UID: 0 PID: 20835 Comm: syz.3.4250 Not tainted syzkaller #0 PREEMPT(full) 
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+0xa52/0xd00 net/mac80211/iface.c:1255
 ieee80211_do_stop+0x1786/0x1f60 net/mac80211/iface.c:746
 ieee80211_stop+0x1b1/0x240 net/mac80211/iface.c:828
 __dev_close_many+0x364/0x6f0 net/core/dev.c:1756
 netif_close_many+0x225/0x410 net/core/dev.c:1781
 netif_close+0x158/0x210 net/core/dev.c:1798
 dev_close+0x10a/0x220 net/core/dev_api.c:220
 cfg80211_shutdown_all_interfaces+0xd4/0x220 net/wireless/core.c:280
 cfg80211_rfkill_set_block+0x2d/0x50 net/wireless/core.c:310
 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346
 rfkill_fop_write+0x44b/0x570 net/rfkill/core.c:1301
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbceb8f6c9
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:00007fbbcfa30038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbbcede5fa0 RCX: 00007fbbceb8f6c9
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000008
RBP: 00007fbbcec11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbbcede6038 R14: 00007fbbcede5fa0 R15: 00007ffd05a68698
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888047b63a80 pfn:0x47b60
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f8(unknown)
raw: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
raw: ffff888047b63a80 0000000000000000 00000000f8000000 0000000000000000
head: 00fff00000000040 0000000000000000 dead000000000122 0000000000000000
head: ffff888047b63a80 0000000000000000 00000000f8000000 0000000000000000
head: 00fff00000000002 ffffea00011ed801 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 12532, tgid 12532 (syz-executor), ts 337218700996, free_ts 297447370395
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:5591
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5622
 __do_kmalloc_node mm/slub.c:5638 [inline]
 __kvmalloc_node_noprof+0x6e/0x910 mm/slub.c:7108
 alloc_netdev_mqs+0xa6/0x11b0 net/core/dev.c:11989
 ieee80211_if_add+0x46c/0x1390 net/mac80211/iface.c:2227
 ieee80211_register_hw+0x35a5/0x40d0 net/mac80211/main.c:1607
 mac80211_hwsim_new_radio+0x2f9a/0x5260 drivers/net/wireless/virtual/mac80211_hwsim.c:5810
 hwsim_new_radio_nl+0xf5b/0x1bd0 drivers/net/wireless/virtual/mac80211_hwsim.c:6504
 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
page last free pid 5833 tgid 5833 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 discard_slab mm/slub.c:3330 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3876
 put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3951
 __slab_free+0x2b9/0x390 mm/slub.c:5929
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4978 [inline]
 slab_alloc_node mm/slub.c:5288 [inline]
 __do_kmalloc_node mm/slub.c:5649 [inline]
 __kvmalloc_node_noprof+0x577/0x910 mm/slub.c:7108
 xt_jumpstack_alloc net/netfilter/x_tables.c:1356 [inline]
 xt_replace_table+0x18a/0x790 net/netfilter/x_tables.c:1395
 __do_replace+0x163/0xaa0 net/ipv4/netfilter/arp_tables.c:912
 do_replace net/ipv4/netfilter/arp_tables.c:989 [inline]
 do_arpt_set_ctl+0xa2a/0xf10 net/ipv4/netfilter/arp_tables.c:1429
 nf_setsockopt+0x26f/0x290 net/netfilter/nf_sockopt.c:101
 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2360
 __sys_setsockopt net/socket.c:2385 [inline]
 __do_sys_setsockopt net/socket.c:2391 [inline]
 __se_sys_setsockopt net/socket.c:2388 [inline]
 __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2388
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888047b63c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff888047b63c80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff888047b63d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
                                                 ^
 ffff888047b63d80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff888047b63e00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================


---
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