FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop2): Can't find a valid FAT filesystem ================================================================== BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:141 [inline] BUG: KASAN: use-after-free in ip6_xmit+0x1838/0x1b80 net/ipv6/ip6_output.c:254 Read of size 8 at addr ffff8801cfea5b58 by task syz-executor5/14256 CPU: 0 PID: 14256 Comm: syz-executor5 Not tainted 4.9.123-g7fa8c15 #28 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d7687540 ffffffff81eb9689 ffffea00073fa940 ffff8801cfea5b58 0000000000000000 ffff8801cfea5b58 0000000000000040 ffff8801d7687578 ffffffff8156c3fe ffff8801cfea5b58 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] ip6_dst_idev include/net/ip6_fib.h:141 [inline] [] ip6_xmit+0x1838/0x1b80 net/ipv6/ip6_output.c:254 [] inet6_csk_xmit+0x27c/0x4d0 net/ipv6/inet6_connection_sock.c:178 [] l2tp_xmit_core net/l2tp/l2tp_core.c:1178 [inline] [] l2tp_xmit_skb+0xc45/0xf30 net/l2tp/l2tp_core.c:1273 [] pppol2tp_sendmsg+0x4e0/0x790 net/l2tp/l2tp_ppp.c:339 [] sock_sendmsg_nosec net/socket.c:648 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:658 [] ___sys_sendmsg+0x47a/0x840 net/socket.c:1982 [] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2072 [] SYSC_sendmmsg net/socket.c:2103 [inline] [] SyS_sendmmsg+0x35/0x60 net/socket.c:2098 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 22188: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] kmem_cache_alloc+0xbe/0x290 mm/slub.c:2728 dst_alloc+0xb5/0x1a0 net/core/dst.c:210 rt_dst_alloc+0x78/0x430 net/ipv4/route.c:1486 __mkroute_output net/ipv4/route.c:2145 [inline] __ip_route_output_key_hash+0x9ac/0x23c0 net/ipv4/route.c:2355 __ip_route_output_key include/net/route.h:123 [inline] ip_route_output_flow+0x29/0xa0 net/ipv4/route.c:2442 ip_route_output_ports include/net/route.h:160 [inline] ip_queue_xmit+0x1231/0x1ba0 net/ipv4/ip_output.c:456 __tcp_transmit_skb+0x16af/0x2e00 net/ipv4/tcp_output.c:1041 tcp_transmit_skb net/ipv4/tcp_output.c:1057 [inline] tcp_write_xmit+0x10f1/0x4ca0 net/ipv4/tcp_output.c:2221 __tcp_push_pending_frames+0xa0/0x240 net/ipv4/tcp_output.c:2402 tcp_sendmsg+0x2163/0x3040 net/ipv4/tcp.c:1326 inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770 sock_sendmsg_nosec net/socket.c:648 [inline] sock_sendmsg+0xcc/0x110 net/socket.c:658 SYSC_sendto+0x21c/0x370 net/socket.c:1683 SyS_sendto+0x40/0x50 net/socket.c:1651 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 0: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kmem_cache_free+0xbe/0x310 mm/slub.c:2980 dst_destroy+0x200/0x360 net/core/dst.c:270 dst_free include/net/dst.h:434 [inline] rt_fibinfo_free+0xbd/0x100 net/ipv4/fib_semantics.c:155 free_nh_exceptions net/ipv4/fib_semantics.c:176 [inline] free_fib_info_rcu+0x15e/0x480 net/ipv4/fib_semantics.c:213 __rcu_reclaim kernel/rcu/rcu.h:118 [inline] rcu_do_batch kernel/rcu/tree.c:2789 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037 __do_softirq+0x210/0x940 kernel/softirq.c:288 The buggy address belongs to the object at ffff8801cfea5b40 which belongs to the cache ip_dst_cache of size 216 The buggy address is located 24 bytes inside of 216-byte region [ffff8801cfea5b40, ffff8801cfea5c18) The buggy address belongs to the page: page:ffffea00073fa940 count:1 mapcount:0 mapping: (null) index:0xffff8801cfea5c80 flags: 0x8000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cfea5a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cfea5a80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc >ffff8801cfea5b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801cfea5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cfea5c00: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc 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