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BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x210/0x214 net/mac80211/iface.c:915
Read of size 2 at addr ffff0000c369adfb by task syz.4.793/7577

CPU: 1 PID: 7577 Comm: syz.4.793 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 ieee80211_monitor_select_queue+0x210/0x214 net/mac80211/iface.c:915
 netdev_core_pick_tx+0x130/0x320 net/core/dev.c:4245
 __dev_queue_xmit+0x730/0x3154 net/core/dev.c:4331
 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3053
 packet_snd net/packet/af_packet.c:3160 [inline]
 packet_sendmsg+0x2de8/0x3d64 net/packet/af_packet.c:3191
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x588/0x90c net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x288/0x374 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 4428:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node+0xdc/0x184 mm/slab_common.c:943
 kmalloc_node include/linux/slab.h:589 [inline]
 kvmalloc_node+0x88/0x1d4 mm/util.c:581
 expand_one_shrinker_info mm/vmscan.c:246 [inline]
 expand_shrinker_info mm/vmscan.c:337 [inline]
 prealloc_memcg_shrinker mm/vmscan.c:381 [inline]
 __prealloc_shrinker+0x414/0x6f0 mm/vmscan.c:637
 prealloc_shrinker+0x20/0x30 mm/vmscan.c:678
 alloc_super+0x60c/0x840 fs/super.c:268
 sget+0x190/0x420 fs/super.c:676
 mount_nodev+0x44/0x108 fs/super.c:1495
 ovl_mount+0x3c/0x50 fs/overlayfs/super.c:2186
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1584
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000c369a000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1531 bytes to the right of
 2048-byte region [ffff0000c369a000, ffff0000c369a800)

The buggy address belongs to the physical page:
page:0000000028eb78e0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103698
head:0000000028eb78e0 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002900
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c369ac80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c369ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000c369ad80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff0000c369ae00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c369ae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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