Hi! I've got the following error report while running the syzkaller fuzzer. On commit a121103c922847ba5010819a3f250f1f7fc84ab8 (4.10-rc3). A reproducer is attached. ================================================================== BUG: KASAN: use-after-free in sock_wfree+0x118/0x120 Read of size 8 at addr ffff880062da0060 by task a.out/4140 page:ffffea00018b6800 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x100000000008100(slab|head) raw: 0100000000008100 0000000000000000 0000000000000000 0000000180130013 raw: dead000000000100 dead000000000200 ffff88006741f140 0000000000000000 page dumped because: kasan: bad access detected CPU: 0 PID: 4140 Comm: a.out Not tainted 4.10.0-rc3+ #59 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:15 dump_stack+0x292/0x398 lib/dump_stack.c:51 describe_address mm/kasan/report.c:262 kasan_report_error+0x121/0x560 mm/kasan/report.c:370 kasan_report mm/kasan/report.c:392 __asan_report_load8_noabort+0x3e/0x40 mm/kasan/report.c:413 sock_flag ./arch/x86/include/asm/bitops.h:324 sock_wfree+0x118/0x120 net/core/sock.c:1631 skb_release_head_state+0xfc/0x250 net/core/skbuff.c:655 skb_release_all+0x15/0x60 net/core/skbuff.c:668 __kfree_skb+0x15/0x20 net/core/skbuff.c:684 kfree_skb+0x16e/0x4e0 net/core/skbuff.c:705 inet_frag_destroy+0x121/0x290 net/ipv4/inet_fragment.c:304 inet_frag_put ./include/net/inet_frag.h:133 nf_ct_frag6_gather+0x1125/0x38b0 net/ipv6/netfilter/nf_conntrack_reasm.c:617 ipv6_defrag+0x21b/0x350 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:68 nf_hook_entry_hookfn ./include/linux/netfilter.h:102 nf_hook_slow+0xc3/0x290 net/netfilter/core.c:310 nf_hook ./include/linux/netfilter.h:212 __ip6_local_out+0x52c/0xaf0 net/ipv6/output_core.c:160 ip6_local_out+0x2d/0x170 net/ipv6/output_core.c:170 ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1722 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1742 rawv6_push_pending_frames net/ipv6/raw.c:613 rawv6_sendmsg+0x2cff/0x4130 net/ipv6/raw.c:927 inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:744 sock_sendmsg_nosec net/socket.c:635 sock_sendmsg+0xca/0x110 net/socket.c:645 sock_write_iter+0x326/0x620 net/socket.c:848 new_sync_write fs/read_write.c:499 __vfs_write+0x483/0x760 fs/read_write.c:512 vfs_write+0x187/0x530 fs/read_write.c:560 SYSC_write fs/read_write.c:607 SyS_write+0xfb/0x230 fs/read_write.c:599 entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:203 RIP: 0033:0x7ff26e6f5b79 RSP: 002b:00007ff268e0ed98 EFLAGS: 00000206 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff268e0f9c0 RCX: 00007ff26e6f5b79 RDX: 0000000000000010 RSI: 0000000020f50fe1 RDI: 0000000000000003 RBP: 00007ff26ebc1220 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ff268e0f9c0 R14: 00007ff26efec040 R15: 0000000000000003 The buggy address belongs to the object at ffff880062da0000 which belongs to the cache RAWv6 of size 1504 The buggy address ffff880062da0060 is located 96 bytes inside of 1504-byte region [ffff880062da0000, ffff880062da05e0) Freed by task 4113: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:502 set_track mm/kasan/kasan.c:514 kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:578 slab_free_hook mm/slub.c:1352 slab_free_freelist_hook mm/slub.c:1374 slab_free mm/slub.c:2951 kmem_cache_free+0xb2/0x2c0 mm/slub.c:2973 sk_prot_free net/core/sock.c:1377 __sk_destruct+0x49c/0x6e0 net/core/sock.c:1452 sk_destruct+0x47/0x80 net/core/sock.c:1460 __sk_free+0x57/0x230 net/core/sock.c:1468 sk_free+0x23/0x30 net/core/sock.c:1479 sock_put ./include/net/sock.h:1638 sk_common_release+0x31e/0x4e0 net/core/sock.c:2782 rawv6_close+0x54/0x80 net/ipv6/raw.c:1214 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:425 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:431 sock_release+0x8d/0x1e0 net/socket.c:599 sock_close+0x16/0x20 net/socket.c:1063 __fput+0x332/0x7f0 fs/file_table.c:208 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x19b/0x270 kernel/task_work.c:116 exit_task_work ./include/linux/task_work.h:21 do_exit+0x186b/0x2800 kernel/exit.c:839 do_group_exit+0x149/0x420 kernel/exit.c:943 SYSC_exit_group kernel/exit.c:954 SyS_exit_group+0x1d/0x20 kernel/exit.c:952 entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:203 Allocated by task 4115: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:502 set_track mm/kasan/kasan.c:514 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:605 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:544 slab_post_alloc_hook mm/slab.h:432 slab_alloc_node mm/slub.c:2708 slab_alloc mm/slub.c:2716 kmem_cache_alloc+0x1af/0x250 mm/slub.c:2721 sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1334 sk_alloc+0x105/0x1010 net/core/sock.c:1396 inet6_create+0x44d/0x1150 net/ipv6/af_inet6.c:183 __sock_create+0x4f6/0x880 net/socket.c:1199 sock_create net/socket.c:1239 SYSC_socket net/socket.c:1269 SyS_socket+0xf9/0x230 net/socket.c:1249 entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:203 Memory state around the buggy address: ffff880062d9ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880062d9ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff880062da0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880062da0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880062da0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================