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BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: use-after-free in memcpy_dir crypto/scatterwalk.c:23 [inline]
BUG: KASAN: use-after-free in scatterwalk_copychunks+0x271/0x6a0 crypto/scatterwalk.c:38
Read of size 4 at addr ffff888057f76000 by task kworker/u4:8/21073

CPU: 0 PID: 21073 Comm: kworker/u4:8 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 memcpy+0x20/0x60 mm/kasan/shadow.c:65
 memcpy include/linux/fortify-string.h:191 [inline]
 memcpy_dir crypto/scatterwalk.c:23 [inline]
 scatterwalk_copychunks+0x271/0x6a0 crypto/scatterwalk.c:38
 skcipher_next_slow crypto/skcipher.c:278 [inline]
 skcipher_walk_next+0x7af/0x1680 crypto/skcipher.c:363
 skcipher_walk_done+0x7a3/0xf00 crypto/skcipher.c:159
 crypto_ctr_crypt+0x281/0x550 crypto/ctr.c:116
 crypto_skcipher_encrypt+0xaa/0xf0 crypto/skcipher.c:630
 crypto_gcm_encrypt+0x38f/0x4b0 crypto/gcm.c:461
 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82
 padata_do_parallel+0x754/0x8b0 kernel/padata.c:230
 pcrypt_aead_encrypt+0x39f/0x4d0 crypto/pcrypt.c:115
 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82
 padata_parallel_worker+0x60/0xb0 kernel/padata.c:157
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the page:
page:ffffea00015fdd80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x57f76
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00015fc888 ffffea00015fd288 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x1112c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_MOVABLE|0x1000000), pid 21063, ts 482267125061, free_ts 482629519804
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
 __page_cache_alloc mm/filemap.c:1005 [inline]
 __page_cache_alloc+0x303/0x3a0 mm/filemap.c:990
 page_cache_ra_unbounded+0x348/0x930 mm/readahead.c:215
 do_page_cache_ra mm/readahead.c:267 [inline]
 ondemand_readahead+0x61e/0x11a0 mm/readahead.c:550
 page_cache_async_ra mm/readahead.c:607 [inline]
 page_cache_async_ra+0x2e1/0x3f0 mm/readahead.c:582
 page_cache_async_readahead include/linux/pagemap.h:907 [inline]
 filemap_readahead mm/filemap.c:2442 [inline]
 filemap_get_pages+0x61a/0x1940 mm/filemap.c:2483
 filemap_read+0x2ca/0xe40 mm/filemap.c:2550
 generic_file_read_iter+0x397/0x4f0 mm/filemap.c:2701
 ext4_file_read_iter+0x1d4/0x5d0 fs/ext4/file.c:130
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x450/0x6c0 fs/splice.c:311
 do_splice_to+0x1bf/0x250 fs/splice.c:796
 splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870
 do_splice_direct+0x1b3/0x280 fs/splice.c:979
 do_sendfile+0x9f0/0x1120 fs/read_write.c:1260
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1346 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page_list+0x1a1/0x1050 mm/page_alloc.c:3448
 release_pages+0x824/0x20b0 mm/swap.c:972
 __pagevec_release+0x77/0x100 mm/swap.c:992
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x320/0x1030 mm/truncate.c:329
 truncate_inode_pages mm/truncate.c:424 [inline]
 truncate_pagecache+0x63/0x90 mm/truncate.c:736
 ext4_setattr+0x11dc/0x2000 fs/ext4/inode.c:5498
 notify_change+0xb28/0x10f0 fs/attr.c:398
 do_truncate+0x13c/0x200 fs/open.c:64
 handle_truncate fs/namei.c:3030 [inline]
 do_open fs/namei.c:3378 [inline]
 path_openat+0x20f4/0x27f0 fs/namei.c:3507
 do_filp_open+0x1aa/0x400 fs/namei.c:3534
 do_sys_openat2+0x16d/0x420 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_creat fs/open.c:1294 [inline]
 __se_sys_creat fs/open.c:1288 [inline]
 __x64_sys_creat+0xc9/0x120 fs/open.c:1288
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888057f75f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888057f75f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888057f76000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888057f76080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888057f76100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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