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BUG: KASAN: slab-out-of-bounds in sg_assign_page include/linux/scatterlist.h:131 [inline]
BUG: KASAN: slab-out-of-bounds in sg_set_page include/linux/scatterlist.h:162 [inline]
BUG: KASAN: slab-out-of-bounds in af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711
Read of size 8 at addr ffff888028dfe920 by task syz.0.169/6501

CPU: 0 UID: 0 PID: 6501 Comm: syz.0.169 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 sg_assign_page include/linux/scatterlist.h:131 [inline]
 sg_set_page include/linux/scatterlist.h:162 [inline]
 af_alg_pull_tsgl+0x1c6/0x740 crypto/af_alg.c:711
 _skcipher_recvmsg crypto/algif_skcipher.c:152 [inline]
 skcipher_recvmsg+0x5df/0x1140 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg+0x172/0x1b0 net/socket.c:1100
 sock_read_iter+0x25a/0x330 net/socket.c:1170
 do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
 vfs_readv+0x292/0x850 fs/read_write.c:1020
 do_readv+0x15a/0x2e0 fs/read_write.c:1082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc616dfc819
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:00007fc61504e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007fc617075fa0 RCX: 00007fc616dfc819
RDX: 0000000000000001 RSI: 0000200000003c80 RDI: 0000000000000004
RBP: 00007fc616e92c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc617076038 R14: 00007fc617075fa0 R15: 00007fffdba1e278
 </TASK>

Allocated by task 6501:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5260 [inline]
 __kmalloc_noprof+0x3e7/0x7b0 mm/slub.c:5272
 kmalloc_noprof include/linux/slab.h:954 [inline]
 sock_kmalloc+0xd6/0x160 net/core/sock.c:2880
 _skcipher_recvmsg crypto/algif_skcipher.c:144 [inline]
 skcipher_recvmsg+0x54d/0x1140 crypto/algif_skcipher.c:221
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg+0x172/0x1b0 net/socket.c:1100
 sock_read_iter+0x25a/0x330 net/socket.c:1170
 do_iter_readv_writev+0x62b/0x8d0 fs/read_write.c:-1
 vfs_readv+0x292/0x850 fs/read_write.c:1020
 do_readv+0x15a/0x2e0 fs/read_write.c:1082
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888028dfe900
 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 [ffff888028dfe900, ffff888028dfe920)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28dfe
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88813fe1a780 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 1971, tgid 1971 (kworker/u8:1), ts 14212817989, free_ts 14212083756
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x334/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 __pcs_replace_empty_main+0x35c/0x710 mm/slub.c:4615
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 __kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5375
 kmalloc_noprof include/linux/slab.h:950 [inline]
 slab_free_hook mm/slub.c:2637 [inline]
 slab_free mm/slub.c:6165 [inline]
 kmem_cache_free+0x159/0x6b0 mm/slub.c:6295
 __exit_signal kernel/exit.c:218 [inline]
 release_task+0xfee/0x16f0 kernel/exit.c:265
 exit_notify kernel/exit.c:777 [inline]
 do_exit+0x1674/0x23c0 kernel/exit.c:988
 call_usermodehelper_exec_async+0x35a/0x360 kernel/umh.c:122
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 13 tgid 13 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xfe3/0x1170 mm/page_alloc.c:2978
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
 __kasan_populate_vmalloc+0x1b2/0x1d0 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129
 __get_vm_area_node+0x226/0x350 mm/vmalloc.c:3232
 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024
 __vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124
 alloc_thread_stack_node kernel/fork.c:355 [inline]
 dup_task_struct+0x275/0x9a0 kernel/fork.c:924
 copy_process+0x508/0x3cd0 kernel/fork.c:2050
 kernel_clone+0x249/0x840 kernel/fork.c:2653
 user_mode_thread+0x110/0x180 kernel/fork.c:2729
 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888028dfe800: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888028dfe880: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff888028dfe900: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
                               ^
 ffff888028dfe980: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888028dfea00: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
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