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BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740
Read of size 8 at addr ffff888026b8af60 by task syz.1.12689/23053

CPU: 0 UID: 0 PID: 23053 Comm: syz.1.12689 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: 0033:0x7ff7db95d04e
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:00007ff7dc833e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007ff7dc8356c0 RCX: 00007ff7db95d04e
RDX: 0000000000001000 RSI: 00007ff7dc834000 RDI: 000000000000000a
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a
R13: 00007ff7dc833f58 R14: 00007ff7dc834000 R15: 0000000000000000
 </TASK>

Allocated by task 23053:
 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 ffff888026b8af40
 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 [ffff888026b8af40, ffff888026b8af60)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26b8a
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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 19279, tgid 19278 (syz.0.3456), ts 301440096191, free_ts 301343563123
 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
 security_sk_alloc+0x52/0x360
 sk_prot_alloc+0x101/0x210
 sk_alloc+0x3a/0x390
 __netlink_create+0x65/0x260
 netlink_create+0x3ca/0x590
 __sock_create+0x4b2/0x9d0
 __sys_socket+0xd6/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0x14d/0xf80
page last free pid 19272 tgid 19272 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 __slab_free+0x263/0x2b0
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 vm_area_alloc+0x24/0x140
 mmap_region+0x10e0/0x22a0
 do_mmap+0xc39/0x10c0
 vm_mmap_pgoff+0x2c9/0x4f0
 ksys_mmap_pgoff+0x51e/0x760
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888026b8ae00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888026b8ae80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff888026b8af00: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff888026b8af80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888026b8b000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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