================================================================== BUG: KASAN: slab-out-of-bounds in cfg80211_wext_freq+0x1f1/0x230 net/wireless/wext-compat.c:235 Read of size 2 at addr ffff888065897d40 by task syz.2.339/4835 CPU: 0 PID: 4835 Comm: syz.2.339 Not tainted 5.15.162-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 cfg80211_wext_freq+0x1f1/0x230 net/wireless/wext-compat.c:235 cfg80211_wext_siwscan+0x4fd/0xfc0 net/wireless/scan.c:2831 ioctl_standard_iw_point+0x781/0xca0 net/wireless/wext-core.c:848 ioctl_standard_call+0xc3/0x280 net/wireless/wext-core.c:1033 wext_ioctl_dispatch+0x16f/0x460 net/wireless/wext-core.c:997 wext_handle_ioctl+0x15b/0x260 net/wireless/wext-core.c:1058 sock_ioctl+0x13b/0x770 net/socket.c:1191 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb1d2789bd9 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:00007fb1d120a048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb1d2917f60 RCX: 00007fb1d2789bd9 RDX: 0000000020000000 RSI: 0000000000008b18 RDI: 0000000000000003 RBP: 00007fb1d27f8e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb1d2917f60 R15: 00007ffcbcab9e28 Allocated by task 4835: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x168/0x300 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] ioctl_standard_iw_point+0x4aa/0xca0 net/wireless/wext-core.c:809 ioctl_standard_call+0xc3/0x280 net/wireless/wext-core.c:1033 wext_ioctl_dispatch+0x16f/0x460 net/wireless/wext-core.c:997 wext_handle_ioctl+0x15b/0x260 net/wireless/wext-core.c:1058 sock_ioctl+0x13b/0x770 net/socket.c:1191 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 assoc_array_gc+0x1533/0x17c0 lib/assoc_array.c:1719 keyring_gc+0x232/0x280 security/keys/keyring.c:1740 key_garbage_collector+0x46f/0xa00 security/keys/gc.c:364 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 The buggy address belongs to the object at ffff888065897c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 320 bytes inside of 512-byte region [ffff888065897c00, ffff888065897e00) The buggy address belongs to the page: page:ffffea0001962500 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888065897800 pfn:0x65894 head:ffffea0001962500 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000075b100 0000000300000003 ffff888011c41c80 raw: ffff888065897800 0000000080100007 00000001ffffffff 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 3503, ts 45847407047, free_ts 45847229278 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a0/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x426/0xa80 net/ipv6/mcast.c:936 ipv6_add_dev+0xd44/0x1180 net/ipv6/addrconf.c:464 addrconf_notify+0x671/0xf30 net/ipv6/addrconf.c:3578 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2044 register_netdevice+0x12e8/0x1720 net/core/dev.c:10388 veth_newlink+0x94f/0xe20 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3501 [inline] rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5629 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1352 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 stack_depot_save+0x3ef/0x440 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xa5/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] fill_pool lib/debugobjects.c:171 [inline] __debug_object_init+0xa0a/0xd30 lib/debugobjects.c:614 debug_timer_init kernel/time/timer.c:724 [inline] debug_init kernel/time/timer.c:772 [inline] init_timer_key+0x3e/0x2d0 kernel/time/timer.c:816 ipv6_mc_init_dev+0x119/0x900 net/ipv6/mcast.c:2767 ipv6_add_dev+0xc48/0x1180 net/ipv6/addrconf.c:452 addrconf_notify+0x671/0xf30 net/ipv6/addrconf.c:3578 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2044 register_netdevice+0x12e8/0x1720 net/core/dev.c:10388 veth_newlink+0x94f/0xe20 drivers/net/veth.c:1714 __rtnl_newlink net/core/rtnetlink.c:3501 [inline] rtnl_newlink+0x14bd/0x2070 net/core/rtnetlink.c:3549 Memory state around the buggy address: ffff888065897c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888065897c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888065897d00: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc ^ ffff888065897d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888065897e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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