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BUG: KASAN: slab-out-of-bounds in cfg80211_wext_freq+0x1f9/0x240 net/wireless/wext-compat.c:238
Read of size 2 at addr ffff88802ed16940 by task syz-executor.4/13855

CPU: 1 PID: 13855 Comm: syz-executor.4 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:91 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 cfg80211_wext_freq+0x1f9/0x240 net/wireless/wext-compat.c:238
 cfg80211_wext_siwscan+0x4fd/0x10d0 net/wireless/scan.c:3463
 ioctl_standard_iw_point+0x788/0xcb0 net/wireless/wext-core.c:867
 ioctl_standard_call+0xc7/0x290 net/wireless/wext-core.c:1052
 wext_ioctl_dispatch+0x58e/0x640 net/wireless/wext-core.c:1016
 wext_handle_ioctl+0x15f/0x270 net/wireless/wext-core.c:1077
 sock_ioctl+0x17f/0x8e0 net/socket.c:1275
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0c4407cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c44de10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0c441b3f80 RCX: 00007f0c4407cea9
RDX: 0000000020000000 RSI: 0000000000008b18 RDI: 0000000000000004
RBP: 00007f0c440ebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0c441b3f80 R15: 00007ffd323ef2b8
 </TASK>

Allocated by task 13855:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4140 [inline]
 __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4153
 kmalloc_noprof include/linux/slab.h:664 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 ioctl_standard_iw_point+0x4ae/0xcb0 net/wireless/wext-core.c:828
 ioctl_standard_call+0xc7/0x290 net/wireless/wext-core.c:1052
 wext_ioctl_dispatch+0x58e/0x640 net/wireless/wext-core.c:1016
 wext_handle_ioctl+0x15f/0x270 net/wireless/wext-core.c:1077
 sock_ioctl+0x17f/0x8e0 net/socket.c:1275
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802ed16800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes to the right of
 allocated 316-byte region [ffff88802ed16800, ffff88802ed1693c)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ed14
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: 0xfdffffff(slab)
raw: 00fff00000000040 ffff888015041c80 ffffea0001e3c300 dead000000000002
raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff888015041c80 ffffea0001e3c300 dead000000000002
head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea0000bb4501 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2795, tgid 2795 (kworker/u8:6), ts 62367872097, free_ts 61987058060
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1470
 prep_new_page mm/page_alloc.c:1478 [inline]
 get_page_from_freelist+0x2cbd/0x2d70 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4715
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2283
 allocate_slab+0x5a/0x2f0 mm/slub.c:2446
 new_slab mm/slub.c:2499 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3685
 __slab_alloc+0x58/0xa0 mm/slub.c:3775
 __slab_alloc_node mm/slub.c:3828 [inline]
 slab_alloc_node mm/slub.c:4007 [inline]
 __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4166
 kmalloc_noprof include/linux/slab.h:660 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 mca_alloc net/ipv6/mcast.c:880 [inline]
 __ipv6_dev_mc_inc+0x426/0xa90 net/ipv6/mcast.c:936
 addrconf_join_solict net/ipv6/addrconf.c:2240 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4101 [inline]
 addrconf_dad_work+0x448/0x16f0 net/ipv6/addrconf.c:4226
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 5170 tgid 5170 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1089 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2621
 __slab_free+0x31b/0x3d0 mm/slub.c:4366
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3959 [inline]
 slab_alloc_node mm/slub.c:4019 [inline]
 __do_kmalloc_node mm/slub.c:4139 [inline]
 __kmalloc_noprof+0x1a3/0x400 mm/slub.c:4153
 kmalloc_noprof include/linux/slab.h:664 [inline]
 load_elf_phdrs fs/binfmt_elf.c:526 [inline]
 load_elf_binary+0x2f1/0x25a0 fs/binfmt_elf.c:855
 search_binary_handler fs/exec.c:1790 [inline]
 exec_binprm fs/exec.c:1832 [inline]
 bprm_execve+0xaf8/0x1770 fs/exec.c:1883
 kernel_execve+0x8e5/0xa10 fs/exec.c:2050
 call_usermodehelper_exec_async+0x237/0x380 kernel/umh.c:110
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff88802ed16800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802ed16880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802ed16900: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc
                                           ^
 ffff88802ed16980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ed16a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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