================================================================== BUG: KASAN: use-after-free in primary_event_id kernel/events/core.c:1316 [inline] BUG: KASAN: use-after-free in perf_output_read_group kernel/events/core.c:5897 [inline] BUG: KASAN: use-after-free in perf_output_read+0x1046/0x1090 kernel/events/core.c:5932 Read of size 8 at addr ffff888099549ae0 by task syz-executor.2/11812 CPU: 1 PID: 11812 Comm: syz-executor.2 Not tainted 4.14.288-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 primary_event_id kernel/events/core.c:1316 [inline] perf_output_read_group kernel/events/core.c:5897 [inline] perf_output_read+0x1046/0x1090 kernel/events/core.c:5932 perf_output_sample+0xa28/0x16f0 kernel/events/core.c:5974 __perf_event_output kernel/events/core.c:6287 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6300 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549 perf_swevent_overflow kernel/events/core.c:7625 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7653 do_perf_sw_event kernel/events/core.c:7766 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7797 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7809 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x692/0xad0 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff888056f4fa60 EFLAGS: 00050206 RAX: ffffed1012235000 RBX: 0000000000008000 RCX: 0000000000005acb RDX: 0000000000008000 RSI: 0000000020fc8000 RDI: ffff8880911a2535 RBP: 0000000020fc5acb R08: 0000000000000001 R09: ffffed1012234fff R10: ffff8880911a7fff R11: 0000000000000000 R12: ffff8880911a0000 R13: 00007ffffffff000 R14: 0000000020fcdacb R15: ffff88805bbcc1c0 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x19c/0x760 lib/iov_iter.c:610 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1892 [inline] skb_copy_to_page_nocache include/net/sock.h:1918 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f2a4ab7d199 RSP: 002b:00007f2a494f2168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f2a4ac8ff60 RCX: 00007f2a4ab7d199 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006 RBP: 00007f2a4abd713b R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3d71f77f R14: 00007f2a494f2300 R15: 0000000000022000 Allocated by task 9987: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] sock_wmalloc+0xa5/0xf0 net/core/sock.c:1953 __ip6_append_data.isra.0+0x217a/0x2870 net/ipv6/ip6_output.c:1467 ip6_append_data+0x1b8/0x2f0 net/ipv6/ip6_output.c:1623 rawv6_sendmsg+0x108a/0x2fe0 net/ipv6/raw.c:955 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x326/0x800 net/socket.c:2062 __sys_sendmmsg+0x129/0x330 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x2f/0x50 net/socket.c:2178 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 8: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 skb_free_head net/core/skbuff.c:563 [inline] skb_release_data+0x5f6/0x820 net/core/skbuff.c:583 skb_release_all net/core/skbuff.c:640 [inline] __kfree_skb net/core/skbuff.c:654 [inline] kfree_skb+0xe7/0x390 net/core/skbuff.c:672 tcp_v6_rcv+0xb0/0x33a0 net/ipv6/tcp_ipv6.c:1578 ip6_input_finish+0x3e1/0x1580 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:250 [inline] ip6_input+0xb9/0x300 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:476 [inline] ip6_rcv_finish+0x23b/0x7a0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:250 [inline] ipv6_rcv+0xac7/0x1b60 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 process_backlog+0x218/0x6f0 net/core/dev.c:5195 napi_poll net/core/dev.c:5604 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5670 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 The buggy address belongs to the object at ffff888099549a80 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff888099549a80, ffff888099549c80) The buggy address belongs to the page: page:ffffea0002655240 count:1 mapcount:0 mapping:ffff888099549080 index:0xffff888099549d00 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff888099549080 ffff888099549d00 0000000100000001 raw: ffffea0002780620 ffffea00026fdda0 ffff88813fe74940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099549980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099549a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888099549a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888099549b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099549b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================