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BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740
Read of size 8 at addr ffff888012166a60 by task syz.3.12733/25974

CPU: 0 UID: 0 PID: 25974 Comm: syz.3.12733 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_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x215/0x590
 __x64_sys_recvmsg+0x1ba/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc88919cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc88a020028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007fc889416090 RCX: 00007fc88919cdd9
RDX: 0000000000012062 RSI: 0000200000000440 RDI: 000000000000000c
RBP: 00007fc889232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc889416128 R14: 00007fc889416090 R15: 00007ffc02646cf8
 </TASK>

Allocated by task 25974:
 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_recvmsg+0x1e6/0x4a0
 ___sys_recvmsg+0x215/0x590
 __x64_sys_recvmsg+0x1ba/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888012166a40
 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 [ffff888012166a40, ffff888012166a60)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12166
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5890, tgid 5889 (syz.1.7), ts 67652374526, free_ts 25620815472
 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_cache_noprof+0x392/0x660
 ref_tracker_alloc+0x15a/0x4c0
 dst_init+0xd9/0x480
 dst_alloc+0x12a/0x170
 ip_route_input_rcu+0x23e5/0x3130
 ip_route_input_noref+0x17c/0x270
 ip_rcv_finish_core+0x5af/0x1c00
 ip_sublist_rcv+0x3ad/0xa70
 ip_list_rcv+0x3f1/0x450
 __netif_receive_skb_list_core+0x7e5/0x810
page last free pid 1 tgid 1 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 free_reserved_page+0xce/0x120
 free_reserved_area+0x90/0x190
 free_kernel_image_pages+0xa2/0x100
 kernel_init+0x31/0x1d0
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff888012166900: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888012166980: 00 00 00 00 fc fc fc fc 00 00 00 fc fc fc fc fc
>ffff888012166a00: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff888012166a80: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888012166b00: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
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