================================================================== BUG: KASAN: use-after-free in __gtp_encap_destroy+0x194/0x1b0 drivers/net/gtp.c:359 Read of size 8 at addr ffff88805b802bd0 by task syz-executor.1/31582 CPU: 0 PID: 31582 Comm: syz-executor.1 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 __gtp_encap_destroy+0x194/0x1b0 drivers/net/gtp.c:359 gtp_encap_destroy+0x16/0x20 drivers/net/gtp.c:373 udpv6_destroy_sock+0x1df/0x220 net/ipv6/udp.c:1609 sk_common_release+0x64/0x390 net/core/sock.c:3256 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:475 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417b71 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffe27987370 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000417b71 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000bc8 R09: 000000009ecd2bcc R10: 00007ffe27987450 R11: 0000000000000293 R12: ffffffffffffffff R13: 00000000000ad31b R14: 00000000000003e8 R15: 000000000119c034 Allocated by task 31584: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:781 [inline] kvzalloc include/linux/mm.h:789 [inline] alloc_netdev_mqs+0x97/0xea0 net/core/dev.c:10525 rtnl_create_link+0x219/0xad0 net/core/rtnetlink.c:3171 __rtnl_newlink+0xf9b/0x16e0 net/core/rtnetlink.c:3433 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 31584: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kfree+0xdb/0x3b0 mm/slub.c:4124 kvfree+0x42/0x50 mm/util.c:616 netdev_freemem net/core/dev.c:10479 [inline] free_netdev+0x4a9/0x5e0 net/core/dev.c:10648 __rtnl_newlink+0x1484/0x16e0 net/core/rtnetlink.c:3447 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88805b802000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3024 bytes inside of 4096-byte region [ffff88805b802000, ffff88805b803000) The buggy address belongs to the page: page:00000000a0ad73a2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b800 head:00000000a0ad73a2 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010042140 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805b802a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b802b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805b802b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805b802c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805b802c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================