Hello, syzbot found the following issue on: HEAD commit: ff1176468d36 Linux 5.14-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15bb59b2300000 kernel config: https://syzkaller.appspot.com/x/.config?x=1dee114394f7d2c2 dashboard link: https://syzkaller.appspot.com/bug?extid=6cb476b7c69916a0caca compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cb476b7c69916a0caca@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in ieee80211_scan_rx+0x7d0/0x7e0 net/mac80211/scan.c:289 Read of size 4 at addr ffff88801559922c by task syz-executor.0/14290 CPU: 0 PID: 14290 Comm: syz-executor.0 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 ieee80211_scan_rx+0x7d0/0x7e0 net/mac80211/scan.c:289 __ieee80211_rx_handle_packet net/mac80211/rx.c:4707 [inline] ieee80211_rx_list+0x20e8/0x27b0 net/mac80211/rx.c:4899 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:4922 ieee80211_rx include/net/mac80211.h:4552 [inline] ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:783 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 do_softirq.part.0+0xde/0x130 kernel/softirq.c:459 </IRQ> do_softirq kernel/softirq.c:451 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:757 [inline] __dev_queue_xmit+0x1b04/0x3620 net/core/dev.c:4312 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline] netlink_deliver_tap+0x9b5/0xbc0 net/netlink/af_netlink.c:334 __netlink_sendskb net/netlink/af_netlink.c:1258 [inline] netlink_sendskb net/netlink/af_netlink.c:1267 [inline] netlink_unicast+0x697/0x7d0 net/netlink/af_netlink.c:1355 nlmsg_unicast include/net/netlink.h:1050 [inline] netlink_ack+0x5ec/0xa60 net/netlink/af_netlink.c:2474 netlink_rcv_skb+0x33d/0x420 net/netlink/af_netlink.c:2510 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41957c Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b RSP: 002b:00007f82fca71030 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f82fca710f0 RCX: 000000000041957c RDX: 0000000000000064 RSI: 00007f82fca71140 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007f82fca71084 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f82fca71140 R14: 0000000000000005 R15: 0000000000000000 Allocated by task 14295: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x98/0xc0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __do_kmalloc mm/slab.c:3702 [inline] __kmalloc+0x214/0x4d0 mm/slab.c:3711 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] cfg80211_conn_scan+0x195/0xfd0 net/wireless/sme.c:80 cfg80211_sme_connect net/wireless/sme.c:585 [inline] cfg80211_connect+0x15d0/0x2010 net/wireless/sme.c:1257 nl80211_connect+0x1647/0x22a0 net/wireless/nl80211.c:10923 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 15038: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xcd/0x100 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x106/0x2c0 mm/slab.c:3803 ___cfg80211_scan_done+0x474/0x960 net/wireless/scan.c:984 __cfg80211_scan_done+0x2c/0x40 net/wireless/scan.c:1001 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109 fib6_info_release include/net/ip6_fib.h:337 [inline] fib6_info_release include/net/ip6_fib.h:334 [inline] ip6_route_add+0x12d/0x150 net/ipv6/route.c:3861 addrconf_prefix_route+0x30a/0x4e0 net/ipv6/addrconf.c:2415 sit_add_v4_addrs net/ipv6/addrconf.c:3137 [inline] addrconf_sit_config net/ipv6/addrconf.c:3387 [inline] addrconf_notify+0x1a96/0x2400 net/ipv6/addrconf.c:3580 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline] call_netdevice_notifiers net/core/dev.c:2149 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8860 rtnl_configure_link+0x16b/0x240 net/core/rtnetlink.c:3143 __rtnl_newlink+0x109f/0x1760 net/core/rtnetlink.c:3468 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3508 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5574 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888015599200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 44 bytes inside of 256-byte region [ffff888015599200, ffff888015599300) The buggy address belongs to the page: page:ffffea0000556640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15599 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001e52008 ffffea0002046008 ffff888010840500 raw: 0000000000000000 ffff888015599000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 13813, ts 1677185189740, free_ts 1675053513618 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] fib6_info_alloc+0xc1/0x210 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x33e/0x1aa0 net/ipv6/route.c:3762 ip6_route_add+0x24/0x150 net/ipv6/route.c:3856 addrconf_prefix_route+0x30a/0x4e0 net/ipv6/addrconf.c:2415 sit_add_v4_addrs net/ipv6/addrconf.c:3137 [inline] addrconf_sit_config net/ipv6/addrconf.c:3387 [inline] addrconf_notify+0x1a96/0x2400 net/ipv6/addrconf.c:3580 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline] call_netdevice_notifiers net/core/dev.c:2149 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8860 rtnl_configure_link+0x16b/0x240 net/core/rtnetlink.c:3143 __rtnl_newlink+0x109f/0x1760 net/core/rtnetlink.c:3468 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3508 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page_list+0x1a1/0x1050 mm/page_alloc.c:3448 release_pages+0x824/0x20b0 mm/swap.c:972 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu mm/mmu_gather.c:249 [inline] tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:340 exit_mmap+0x1ea/0x620 mm/mmap.c:3203 __mmput+0x122/0x470 kernel/fork.c:1101 mmput+0x58/0x60 kernel/fork.c:1122 exit_mm kernel/exit.c:501 [inline] do_exit+0xae2/0x2a60 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2808 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888015599100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888015599180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888015599200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888015599280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888015599300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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