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BUG: KASAN: use-after-free in skcipher_request_set_tfm include/crypto/skcipher.h:499 [inline]
BUG: KASAN: use-after-free in crypto_aead_copy_sgl crypto/algif_aead.c:85 [inline]
BUG: KASAN: use-after-free in _aead_recvmsg crypto/algif_aead.c:210 [inline]
BUG: KASAN: use-after-free in aead_recvmsg+0x1552/0x1970 crypto/algif_aead.c:313
Read of size 4 at addr ffff8801d7c2219c by task syz-executor0/3971

CPU: 0 PID: 3971 Comm: syz-executor0 Not tainted 4.15.0-rc1+ #197
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 skcipher_request_set_tfm include/crypto/skcipher.h:499 [inline]
 crypto_aead_copy_sgl crypto/algif_aead.c:85 [inline]
 _aead_recvmsg crypto/algif_aead.c:210 [inline]
 aead_recvmsg+0x1552/0x1970 crypto/algif_aead.c:313
 sock_recvmsg_nosec net/socket.c:805 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:812
 ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
 __sys_recvmsg+0xe2/0x210 net/socket.c:2252
 SYSC_recvmsg net/socket.c:2264 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2259
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007fc03c43ec58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000002021 RSI: 0000000020b2dfc8 RDI: 0000000000000014
RBP: 0000000000000473 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3b68
R13: 00000000ffffffff R14: 00007fc03c43f6d4 R15: 0000000000000000

Allocated by task 3971:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3711 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3720
 kmalloc include/linux/slab.h:504 [inline]
 kzalloc include/linux/slab.h:688 [inline]
 crypto_create_tfm+0x82/0x2e0 crypto/api.c:455
 crypto_alloc_tfm+0x10e/0x2f0 crypto/api.c:540
 crypto_alloc_skcipher+0x2c/0x40 crypto/skcipher.c:926
 crypto_get_default_null_skcipher+0x5f/0x80 crypto/crypto_null.c:164
 crypto_get_default_null_skcipher2 include/crypto/null.h:17 [inline]
 aead_bind+0x89/0x140 crypto/algif_aead.c:472
 alg_bind+0x1ab/0x440 crypto/af_alg.c:179
 SYSC_bind+0x1b4/0x3f0 net/socket.c:1475
 SyS_bind+0x24/0x30 net/socket.c:1461
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 3976:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3491 [inline]
 kfree+0xca/0x250 mm/slab.c:3806
 kzfree+0x28/0x30 mm/slab_common.c:1482
 crypto_destroy_tfm+0x140/0x2e0 crypto/api.c:581
 crypto_free_skcipher include/crypto/skcipher.h:212 [inline]
 crypto_put_default_null_skcipher+0x35/0x60 crypto/crypto_null.c:185
 crypto_put_default_null_skcipher2 include/crypto/null.h:22 [inline]
 aead_sock_destruct+0x13c/0x220 crypto/algif_aead.c:522
 __sk_destruct+0xfd/0x910 net/core/sock.c:1558
 sk_destruct+0x47/0x80 net/core/sock.c:1593
 __sk_free+0x57/0x230 net/core/sock.c:1601
 sk_free+0x2a/0x40 net/core/sock.c:1612
 sock_put include/net/sock.h:1655 [inline]
 af_alg_release+0x5d/0x70 crypto/af_alg.c:126
 sock_release+0x8d/0x1e0 net/socket.c:596
 sock_close+0x16/0x20 net/socket.c:1125
 __fput+0x333/0x7f0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96

The buggy address belongs to the object at ffff8801d7c22180
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 28 bytes inside of
 128-byte region [ffff8801d7c22180, ffff8801d7c22200)
The buggy address belongs to the page:
page:ffffea00075f0880 count:1 mapcount:0 mapping:ffff8801d7c22000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d7c22000 0000000000000000 0000000100000015
raw: ffffea000761a8a0 ffffea00076c7960 ffff8801db000640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d7c22080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801d7c22100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801d7c22180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8801d7c22200: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8801d7c22280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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