================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x11d/0x150 lib/list_debug.c:42 Read of size 8 at addr ffff8801c4a784c8 by task syzkaller762943/10780 CPU: 0 PID: 10780 Comm: syzkaller762943 Not tainted 4.15.0-rc2+ #152 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __list_del_entry_valid+0x11d/0x150 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] crypto_larval_kill+0x79/0x2e0 crypto/api.c:164 crypto_alg_mod_lookup+0x178/0x1b0 crypto/api.c:283 crypto_find_alg crypto/api.c:501 [inline] crypto_alloc_tfm+0xf3/0x2f0 crypto/api.c:534 crypto_alloc_aead+0x2c/0x40 crypto/aead.c:342 aead_bind+0x70/0x140 crypto/algif_aead.c:482 alg_bind+0x1ab/0x440 crypto/af_alg.c:179 SYSC_bind+0x1b4/0x3f0 net/socket.c:1454 SyS_bind+0x24/0x30 net/socket.c:1440 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4406f9 RSP: 002b:00007ffc3a820d68 EFLAGS: 00000203 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004406f9 RDX: 0000000000000058 RSI: 00000000201e3fa8 RDI: 0000000000000003 RBP: 0000000000008193 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000000000 R13: 0000000000401c30 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 10780: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3613 kmalloc include/linux/slab.h:499 [inline] kzalloc include/linux/slab.h:688 [inline] crypto_larval_alloc+0x51/0x1e0 crypto/api.c:114 crypto_larval_add crypto/api.c:136 [inline] crypto_larval_lookup.part.8+0x194/0x400 crypto/api.c:232 crypto_larval_lookup crypto/api.c:212 [inline] crypto_alg_mod_lookup+0x77/0x1b0 crypto/api.c:271 crypto_find_alg crypto/api.c:501 [inline] crypto_alloc_tfm+0xf3/0x2f0 crypto/api.c:534 crypto_alloc_aead+0x2c/0x40 crypto/aead.c:342 aead_bind+0x70/0x140 crypto/algif_aead.c:482 alg_bind+0x1ab/0x440 crypto/af_alg.c:179 SYSC_bind+0x1b4/0x3f0 net/socket.c:1454 SyS_bind+0x24/0x30 net/socket.c:1440 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 3267: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3491 [inline] kfree+0xca/0x250 mm/slab.c:3806 crypto_larval_destroy+0x110/0x150 crypto/api.c:107 crypto_alg_put crypto/internal.h:116 [inline] crypto_larval_kill+0x1e8/0x2e0 crypto/api.c:167 crypto_wait_for_test+0x87/0xb0 crypto/algapi.c:351 crypto_register_instance+0x2bf/0x430 crypto/algapi.c:558 aead_register_instance+0x161/0x1c0 crypto/aead.c:421 pcrypt_create_aead crypto/pcrypt.c:322 [inline] pcrypt_create+0x542/0x6c0 crypto/pcrypt.c:346 cryptomgr_probe+0x74/0x240 crypto/algboss.c:75 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441 The buggy address belongs to the object at ffff8801c4a784c0 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff8801c4a784c0, ffff8801c4a788c0) The buggy address belongs to the page: page:00000000dbbad670 count:1 mapcount:0 mapping:000000006a3d3f8c index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c4a78040 0000000000000000 0000000100000007 raw: ffffea0007127fa0 ffffea000712ca20 ffff8801db000ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c4a78380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c4a78400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c4a78480: fb fb fb fb fb fb fb fb fb fb fb fb 00 00 00 00 ^ ffff8801c4a78500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c4a78580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================