================================================================== BUG: KASAN: use-after-free in msg_word net/tipc/msg.h:207 [inline] BUG: KASAN: use-after-free in msg_bits net/tipc/msg.h:217 [inline] BUG: KASAN: use-after-free in msg_hdr_sz net/tipc/msg.h:267 [inline] BUG: KASAN: use-after-free in msg_short net/tipc/msg.h:634 [inline] BUG: KASAN: use-after-free in msg_orignode net/tipc/msg.h:639 [inline] BUG: KASAN: use-after-free in tipc_skb_dump+0x10ff/0x1780 net/tipc/trace.c:73 Read of size 4 at addr ffff8881124a70b0 by task syz.2.30/414 CPU: 0 PID: 414 Comm: syz.2.30 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 msg_word net/tipc/msg.h:207 [inline] msg_bits net/tipc/msg.h:217 [inline] msg_hdr_sz net/tipc/msg.h:267 [inline] msg_short net/tipc/msg.h:634 [inline] msg_orignode net/tipc/msg.h:639 [inline] tipc_skb_dump+0x10ff/0x1780 net/tipc/trace.c:73 tipc_list_dump+0x22b/0x2f0 net/tipc/trace.c:187 tipc_sk_dump+0xa12/0xfb0 net/tipc/socket.c:4008 perf_trace_tipc_sk_class+0x3cc/0x5e0 net/tipc/trace.h:205 trace_tipc_sk_rej_msg net/tipc/trace.h:230 [inline] tipc_sk_enqueue net/tipc/socket.c:2470 [inline] tipc_sk_rcv+0x292e/0x2ca0 net/tipc/socket.c:2502 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703 __tipc_sendstream+0xa6e/0x1190 net/tipc/socket.c:1629 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1553 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc068302159 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:00007fc068163028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc068589fa0 RCX: 00007fc068302159 RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007fc06839903b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc06858a038 R14: 00007fc068589fa0 R15: 00007fff6dc443a8 Allocated by task 414: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc_track_caller+0x13c/0x2c0 mm/slub.c:4959 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb_fclone include/linux/skbuff.h:1233 [inline] tipc_buf_acquire net/tipc/msg.c:72 [inline] tipc_msg_build+0xce/0xf30 net/tipc/msg.c:402 __tipc_sendstream+0x8f3/0x1190 net/tipc/socket.c:1622 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1553 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 415: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 skb_free_head net/core/skbuff.c:656 [inline] skb_release_data+0x7bd/0xa20 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb net/core/skbuff.c:757 [inline] kfree_skb_reason net/core/skbuff.c:778 [inline] kfree_skb+0xb9/0x2f0 net/core/skbuff.c:792 tsk_advance_rx_queue+0x10f/0x240 net/tipc/socket.c:281 tipc_recvstream+0x881/0xe70 net/tipc/socket.c:2057 ____sys_recvmsg+0x2ca/0x5b0 net/socket.c:-1 ___sys_recvmsg+0x213/0x5c0 net/socket.c:2697 __sys_recvmsg net/socket.c:2727 [inline] __do_sys_recvmsg net/socket.c:2737 [inline] __se_sys_recvmsg net/socket.c:2734 [inline] __x64_sys_recvmsg+0x1fe/0x2d0 net/socket.c:2734 x64_sys_call+0x705/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8881124a7000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 176 bytes inside of 1024-byte region [ffff8881124a7000, ffff8881124a7400) The buggy address belongs to the page: page:ffffea0004492800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1124a0 head:ffffea0004492800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043080 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 414, ts 26288721626, free_ts 26265052788 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb_fclone include/linux/skbuff.h:1233 [inline] tipc_buf_acquire net/tipc/msg.c:72 [inline] tipc_msg_build+0xce/0xf30 net/tipc/msg.c:402 __tipc_sendstream+0x8f3/0x1190 net/tipc/socket.c:1622 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1553 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 kmem_cache_alloc_node include/linux/slab.h:492 [inline] __alloc_skb+0xe4/0x730 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline] netlink_sendmsg+0x611/0xb80 net/netlink/af_netlink.c:1898 Memory state around the buggy address: ffff8881124a6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881124a7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881124a7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881124a7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881124a7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================