================================================================== BUG: KASAN: use-after-free in crypto_tfm_alg_blocksize include/linux/crypto.h:671 [inline] BUG: KASAN: use-after-free in crypto_blkcipher_blocksize include/linux/crypto.h:1214 [inline] BUG: KASAN: use-after-free in blkcipher_walk_virt+0x286/0x2a0 crypto/blkcipher.c:304 Read of size 8 at addr ffff8801c5cd61b8 by task syz-executor2/5602 CPU: 0 PID: 5602 Comm: syz-executor2 Not tainted 4.15.0-rc2+ #147 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_load8_noabort+0x14/0x20 mm/kasan/report.c:430 crypto_tfm_alg_blocksize include/linux/crypto.h:671 [inline] crypto_blkcipher_blocksize include/linux/crypto.h:1214 [inline] blkcipher_walk_virt+0x286/0x2a0 crypto/blkcipher.c:304 skcipher_null_crypt+0x10e/0x2d0 crypto/crypto_null.c:85 skcipher_crypt_blkcipher crypto/skcipher.c:622 [inline] skcipher_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:631 crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline] crypto_aead_copy_sgl crypto/algif_aead.c:90 [inline] _aead_recvmsg crypto/algif_aead.c:225 [inline] aead_recvmsg+0xac7/0x1bc0 crypto/algif_aead.c:329 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: 0033:0x452a39 RSP: 002b:00007faf2a499c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39 RDX: 0000000000010002 RSI: 00000000207e9fc8 RDI: 0000000000000015 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee0b8 R13: 00000000ffffffff R14: 00007faf2a49a6d4 R15: 0000000000000007 Allocated by task 5210: 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_alloc_tfm+0xd0/0x4e0 crypto/api.c:359 crypto_init_skcipher_ops_blkcipher crypto/skcipher.c:661 [inline] crypto_skcipher_init_tfm+0x4ee/0x840 crypto/skcipher.c:827 crypto_create_tfm+0xdf/0x2e0 crypto/api.c:462 crypto_alloc_tfm+0x10e/0x2f0 crypto/api.c:540 crypto_alloc_skcipher+0x2c/0x40 crypto/skcipher.c:929 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:488 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 5629: 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_tfm include/linux/crypto.h:641 [inline] crypto_free_blkcipher include/linux/crypto.h:1142 [inline] crypto_exit_skcipher_ops_blkcipher+0x34/0x40 crypto/skcipher.c:647 crypto_exit_ops crypto/api.c:315 [inline] crypto_destroy_tfm+0xb9/0x2e0 crypto/api.c:579 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:538 __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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ae0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 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 ffff8801c5cd6180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 56 bytes inside of 64-byte region [ffff8801c5cd6180, ffff8801c5cd61c0) The buggy address belongs to the page: page:00000000abb9918a count:1 mapcount:0 mapping:0000000049556ac5 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c5cd6000 0000000000000000 0000000100000020 raw: ffffea000746e820 ffffea00074a37a0 ffff8801db000340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c5cd6080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c5cd6100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801c5cd6180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801c5cd6200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c5cd6280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================