==================================================================
BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740
Read of size 8 at addr ffff888113cea660 by task syz.0.11311/16866

CPU: 0 UID: 0 PID: 16866 Comm: syz.0.11311 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_report+0xba/0x230
 kasan_report+0x117/0x150
 af_alg_pull_tsgl+0x1c6/0x740
 skcipher_recvmsg+0x5df/0x1140
 sock_recvmsg+0x172/0x1b0
 __sys_recvfrom+0x240/0x3c0
 __x64_sys_recvfrom+0xde/0x100
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f377cf5d04e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f377dda2e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007f377dda46c0 RCX: 00007f377cf5d04e
RDX: 0000000000001000 RSI: 00007f377dda3000 RDI: 000000000000000a
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a
R13: 00007f377dda2f58 R14: 00007f377dda3000 R15: 0000000000000000
 </TASK>

Allocated by task 16866:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x35c/0x760
 sock_kmalloc+0xd6/0x160
 skcipher_recvmsg+0x54d/0x1140
 sock_recvmsg+0x172/0x1b0
 __sys_recvfrom+0x240/0x3c0
 __x64_sys_recvfrom+0xde/0x100
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888113cea640
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 allocated 32-byte region [ffff888113cea640, ffff888113cea660)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113cea
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff888100041780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5242, tgid 5242 (acpid), ts 27446378244, free_ts 27434442335
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x331/0x3c0
 __pcs_replace_empty_main+0x2e6/0x730
 __kmalloc_noprof+0x474/0x760
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_check_open_permission+0x229/0x470
 security_file_open+0xa9/0x240
 do_dentry_open+0x384/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
page last free pid 15 tgid 15 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x870
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff888113cea500: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888113cea580: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff888113cea600: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff888113cea680: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888113cea700: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
