From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8EEAE24A06A for ; Thu, 2 Apr 2026 00:49:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775090965; cv=none; b=BO+qC8D2pk0srfkszUuhSZFcGkLFWP07Pdt1eCr77PzIrQXLbP524IFwvcZc8BtSdgnqmhQ95zeeyeo9DAnMcxMuBv8MGgcDDXL5RJy3Jrw38FhW8O1RAUVY2ShbXl4ctM/wbHo9qHQRZv8HLNG8PauELTWenFn2c5Q82I3H/IY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775090965; c=relaxed/simple; bh=quIeK+Mo7MQBsJsAeqRrnJkkRUswjh2/gNO5H4ef/Tk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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006d021491bc7-67fabd020c7mr3101243eaf.48.1775090962240; Wed, 01 Apr 2026 17:49:22 -0700 (PDT) Date: Wed, 01 Apr 2026 17:49:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69cdbd12.050a0220.70c3a.0007.GAE@google.com> Subject: [syzbot] [net?] [bpf?] KASAN: slab-use-after-free Read in __sk_msg_recvmsg From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, edumazet@google.com, horms@kernel.org, jakub@cloudflare.com, john.fastabend@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 93d04e76bcf1 Merge branch 'r8152-add-helper-functions-for-.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=14fde46a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=71d49d824b43a0d9 dashboard link: https://syzkaller.appspot.com/bug?extid=431f9a9e3f5227fbb904 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b9baba580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152c5e26580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/953c48b40f73/disk-93d04e76.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/edb39d99bd41/vmlinux-93d04e76.xz kernel image: https://storage.googleapis.com/syzbot-assets/656d4ad35e4a/bzImage-93d04e76.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+431f9a9e3f5227fbb904@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in __sk_msg_recvmsg+0x19b/0xe70 net/core/skmsg.c:431 Read of size 8 at addr ffff88807eeac2b0 by task syz.0.31/6071 CPU: 0 UID: 0 PID: 6071 Comm: syz.0.31 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __sk_msg_recvmsg+0x19b/0xe70 net/core/skmsg.c:431 udp_bpf_recvmsg+0x196/0xac0 net/ipv4/udp_bpf.c:83 sock_recvmsg_nosec net/socket.c:1071 [inline] sock_recvmsg+0x155/0x1b0 net/socket.c:1093 ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2805 ___sys_recvmsg+0x215/0x590 net/socket.c:2847 do_recvmmsg+0x334/0x800 net/socket.c:2942 __sys_recvmmsg net/socket.c:3016 [inline] __do_sys_recvmmsg net/socket.c:3039 [inline] __se_sys_recvmmsg net/socket.c:3032 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3032 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a3579c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a365f2028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f4a35a16180 RCX: 00007f4a3579c819 RDX: 0000000000000012 RSI: 0000200000000400 RDI: 0000000000000003 RBP: 00007f4a35832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000040000021 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4a35a16218 R14: 00007f4a35a16180 R15: 00007ffda3b0e6c8 Allocated by task 6069: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5380 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] alloc_sk_msg net/core/skmsg.c:525 [inline] sk_psock_skb_ingress_self+0x5e/0x370 net/core/skmsg.c:627 sk_psock_verdict_apply net/core/skmsg.c:1062 [inline] sk_psock_verdict_recv+0x7d9/0x8d0 net/core/skmsg.c:1260 udp_read_skb+0x5d9/0x6b0 net/ipv4/udp.c:2014 sk_psock_verdict_data_ready+0x12d/0x590 net/core/skmsg.c:1281 __udp_enqueue_schedule_skb+0xc4b/0x12e0 net/ipv4/udp.c:1745 __udp_queue_rcv_skb net/ipv4/udp.c:2311 [inline] udp_queue_rcv_one_skb+0x831/0x1230 net/ipv4/udp.c:2401 __udp4_lib_mcast_deliver+0xad7/0xb70 net/ipv4/udp.c:2513 udp_rcv+0xcc2/0x24c0 net/ipv4/udp.c:2638 ip_protocol_deliver_rcu+0x282/0x440 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 dst_input include/net/dst.h:480 [inline] ip_sublist_rcv_finish+0x1f0/0x240 net/ipv4/ip_input.c:623 ip_list_rcv_finish net/ipv4/ip_input.c:667 [inline] ip_sublist_rcv+0x5c6/0xa70 net/ipv4/ip_input.c:683 ip_list_rcv+0x3f1/0x450 net/ipv4/ip_input.c:717 __netif_receive_skb_list_ptype net/core/dev.c:6233 [inline] __netif_receive_skb_list_core+0x7e5/0x810 net/core/dev.c:6280 __netif_receive_skb_list net/core/dev.c:6332 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6423 netif_receive_skb_list+0x55/0x4b0 net/core/dev.c:6475 xdp_recv_frames net/bpf/test_run.c:269 [inline] xdp_test_run_batch net/bpf/test_run.c:350 [inline] bpf_test_run_xdp_live+0x1946/0x1cf0 net/bpf/test_run.c:379 bpf_prog_test_run_xdp+0x81c/0x1160 net/bpf/test_run.c:1397 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4722 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6070: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kfree+0x1c1/0x630 mm/slub.c:6483 kfree_sk_msg include/linux/skmsg.h:418 [inline] __sk_msg_recvmsg+0xc7e/0xe70 net/core/skmsg.c:491 udp_bpf_recvmsg+0x196/0xac0 net/ipv4/udp_bpf.c:83 sock_recvmsg_nosec net/socket.c:1071 [inline] sock_recvmsg+0x155/0x1b0 net/socket.c:1093 ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2805 ___sys_recvmsg+0x215/0x590 net/socket.c:2847 do_recvmmsg+0x334/0x800 net/socket.c:2942 __sys_recvmmsg net/socket.c:3016 [inline] __do_sys_recvmmsg net/socket.c:3039 [inline] __se_sys_recvmmsg net/socket.c:3032 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3032 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807eeac000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 688 bytes inside of freed 1024-byte region [ffff88807eeac000, ffff88807eeac400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7eea8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88813fea6dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813fea6dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001fbaa01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 176, tgid 176 (kworker/u8:7), ts 108779589894, free_ts 108254079914 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3292 [inline] allocate_slab+0x77/0x660 mm/slub.c:3481 new_slab mm/slub.c:3539 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7175 refill_sheaf mm/slub.c:2812 [inline] __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] ieee802_11_parse_elems_full+0x159/0x2ab0 net/mac80211/parse.c:1051 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2496 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1565 [inline] ieee80211_ibss_rx_queued_mgmt+0x4ca/0x2ce0 net/mac80211/ibss.c:1596 ieee80211_iface_process_skb net/mac80211/iface.c:1757 [inline] ieee80211_iface_work+0x845/0x1380 net/mac80211/iface.c:1811 cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:513 process_one_work kernel/workqueue.c:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page last free pid 6064 tgid 6061 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5573 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x316/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] iovec_from_user+0x87/0x250 lib/iov_iter.c:1321 __import_iovec+0x163/0x7e0 lib/iov_iter.c:1375 import_iovec+0x73/0xa0 lib/iov_iter.c:1440 copy_msghdr_from_user net/socket.c:2522 [inline] recvmsg_copy_msghdr net/socket.c:2771 [inline] ___sys_recvmsg+0x4bd/0x590 net/socket.c:2843 do_recvmmsg+0x334/0x800 net/socket.c:2942 __sys_recvmmsg net/socket.c:3016 [inline] __do_sys_recvmmsg net/socket.c:3039 [inline] __se_sys_recvmmsg net/socket.c:3032 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3032 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807eeac180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807eeac200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807eeac280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807eeac300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807eeac380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup