================================================================== BUG: KASAN: use-after-free in __xfrm_policy_bysel_ctx.constprop.63+0x3d4/0x460 net/xfrm/xfrm_policy.c:1618 Read of size 1 at addr ffff8880a797fd59 by task syz-executor5/16762 CPU: 1 PID: 16762 Comm: syz-executor5 Not tainted 4.20.0-rc7+ #361 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 __xfrm_policy_bysel_ctx.constprop.63+0x3d4/0x460 net/xfrm/xfrm_policy.c:1618 xfrm_policy_bysel_ctx+0x883/0x1050 net/xfrm/xfrm_policy.c:1664 pfkey_spddelete+0x955/0x10e0 net/key/af_key.c:2417 pfkey_process+0x851/0x9a0 net/key/af_key.c:2844 pfkey_sendmsg+0x5df/0xfb0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 netlink: 'syz-executor1': attribute type 4 has an invalid length. netlink: 'syz-executor1': attribute type 4 has an invalid length. __sys_sendmsg+0x11d/0x280 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c856bcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c856bd6d4 R13: 00000000004c4d47 R14: 00000000004d84c0 R15: 00000000ffffffff Allocated by task 16286: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15b/0x770 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] sock_kmalloc+0x15a/0x1f0 net/core/sock.c:1992 af_alg_alloc_areq+0x83/0x280 crypto/af_alg.c:1097 _aead_recvmsg crypto/algif_aead.c:157 [inline] aead_recvmsg+0x49d/0x1ba0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2278 __sys_recvmsg+0x11a/0x280 net/socket.c:2327 __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg net/socket.c:2334 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2334 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16286: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 __sock_kfree_s net/core/sock.c:2013 [inline] sock_kfree_s+0x29/0x60 net/core/sock.c:2019 af_alg_free_resources+0x6b/0x80 crypto/af_alg.c:1033 _aead_recvmsg crypto/algif_aead.c:321 [inline] aead_recvmsg+0x1330/0x1ba0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2278 __sys_recvmsg+0x11a/0x280 net/socket.c:2327 __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg net/socket.c:2334 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2334 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a797fb40 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 537 bytes inside of 1024-byte region [ffff8880a797fb40, ffff8880a797ff40) The buggy address belongs to the page: page:ffffea00029e5f80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001ae1d08 ffffea0002307808 ffff88812c3f0ac0 raw: 0000000000000000 ffff8880a797e040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a797fc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a797fc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a797fd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a797fd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a797fe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================