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BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740
Read of size 8 at addr ffff8881aade65e0 by task syz.1.10225/6934

CPU: 1 UID: 0 PID: 6934 Comm: syz.1.10225 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: 0033:0x7f645599c819
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:00007f645677d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f6455c15fa0 RCX: 00007f645599c819
RDX: 0000000000000100 RSI: 00002000000005c0 RDI: 0000000000000009
RBP: 00007f6455a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6455c16038 R14: 00007f6455c15fa0 R15: 00007ffe78ab6128
 </TASK>

Allocated by task 6934:
 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 ffff8881aade65c0
 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 [ffff8881aade65c0, ffff8881aade65e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1aade6
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000000 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8246, tgid 8246 (dhcpcd-run-hook), ts 89081842792, free_ts 89081541244
 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
 kmem_cache_free+0x15b/0x630
 tear_down_vmas+0x312/0x520
 exit_mmap+0x4b6/0xa10
 __mmput+0x118/0x430
 exec_mmap+0x3b4/0x440
 begin_new_exec+0x134a/0x24a0
 load_elf_binary+0xa47/0x2980
 bprm_execve+0x93d/0x1460
 do_execveat_common+0x50d/0x690
page last free pid 8246 tgid 8246 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 tlb_finish_mmu+0x144/0x230
 exit_mmap+0x498/0xa10
 __mmput+0x118/0x430
 exec_mmap+0x3b4/0x440
 begin_new_exec+0x134a/0x24a0
 load_elf_binary+0xa47/0x2980
 bprm_execve+0x93d/0x1460
 do_execveat_common+0x50d/0x690
 __x64_sys_execve+0x97/0xc0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881aade6480: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
 ffff8881aade6500: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8881aade6580: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff8881aade6600: 00 00 00 00 fc fc fc fc 00 00 06 fc fc fc fc fc
 ffff8881aade6680: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
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