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BUG: KASAN: slab-out-of-bounds in crypto_morus640_load_a crypto/morus640.c:111 [inline]
BUG: KASAN: slab-out-of-bounds in crypto_morus640_decrypt_chunk+0xcf8/0xd20 crypto/morus640.c:278
Read of size 4 at addr ffff8801ca628ec8 by task syz-executor6/10191

CPU: 1 PID: 10191 Comm: syz-executor6 Not tainted 4.17.0+ #84
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+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 crypto_morus640_load_a crypto/morus640.c:111 [inline]
 crypto_morus640_decrypt_chunk+0xcf8/0xd20 crypto/morus640.c:278
 crypto_morus640_process_crypt.isra.12+0x153/0x230 crypto/morus640.c:376
 crypto_morus640_crypt+0x42e/0x9f0 crypto/morus640.c:442
 crypto_morus640_decrypt+0x23e/0x3d0 crypto/morus640.c:485
 crypto_aead_decrypt include/crypto/aead.h:370 [inline]
 _aead_recvmsg crypto/algif_aead.c:315 [inline]
 aead_recvmsg+0x13cc/0x1ba0 crypto/algif_aead.c:334
 sock_recvmsg_nosec net/socket.c:818 [inline]
 sock_recvmsg+0xd0/0x110 net/socket.c:825
 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2323
 __sys_recvmsg+0x112/0x260 net/socket.c:2372
 __do_sys_recvmsg net/socket.c:2382 [inline]
 __se_sys_recvmsg net/socket.c:2379 [inline]
 __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2379
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b29
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f5eaa39dc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f5eaa39e6d4 RCX: 0000000000455b29
RDX: 0000000000000000 RSI: 0000000020002840 RDI: 0000000000000017
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c084a R14: 00000000004cffe8 R15: 0000000000000000

Allocated by task 10191:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x14e/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:518 [inline]
 kzalloc include/linux/slab.h:706 [inline]
 skcipher_next_slow crypto/skcipher.c:253 [inline]
 skcipher_walk_next+0x750/0x1850 crypto/skcipher.c:357
 skcipher_walk_first+0x151/0x410 crypto/skcipher.c:442
 skcipher_walk_aead_common+0x7f8/0xbc0 crypto/skcipher.c:539
 skcipher_walk_aead_decrypt+0xc7/0x100 crypto/skcipher.c:572
 crypto_morus640_process_crypt.isra.12+0x9c/0x230 crypto/morus640.c:370
 crypto_morus640_crypt+0x42e/0x9f0 crypto/morus640.c:442
 crypto_morus640_decrypt+0x23e/0x3d0 crypto/morus640.c:485
 crypto_aead_decrypt include/crypto/aead.h:370 [inline]
 _aead_recvmsg crypto/algif_aead.c:315 [inline]
 aead_recvmsg+0x13cc/0x1ba0 crypto/algif_aead.c:334
 sock_recvmsg_nosec net/socket.c:818 [inline]
 sock_recvmsg+0xd0/0x110 net/socket.c:825
 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2323
 __sys_recvmsg+0x112/0x260 net/socket.c:2372
 __do_sys_recvmsg net/socket.c:2382 [inline]
 __se_sys_recvmsg net/socket.c:2379 [inline]
 __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2379
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8670:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 shmem_destroy_callback+0xa2/0xc0 mm/shmem.c:3567
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2558 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline]
 rcu_process_callbacks+0xe9d/0x1760 kernel/rcu/tree.c:2802
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:284

The buggy address belongs to the object at ffff8801ca628ec0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 32-byte region [ffff8801ca628ec0, ffff8801ca628ee0)
The buggy address belongs to the page:
page:ffffea0007298a00 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801ca628fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea00075b3688 ffffea00075afc88 ffff8801da8001c0
raw: ffff8801ca628fc1 ffff8801ca628000 000000010000002f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ca628d80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801ca628e00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801ca628e80: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
                                              ^
 ffff8801ca628f00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801ca628f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
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