================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x11d/0x150 lib/list_debug.c:42 Read of size 8 at addr ffff8801c4495248 by task syzkaller830787/6835 CPU: 0 PID: 6835 Comm: syzkaller830787 Not tainted 4.15.0-rc2+ #154 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:00007ffc91fde718 EFLAGS: 00000203 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004406f9 RDX: 0000000000000058 RSI: 0000000020269000 RDI: 0000000000000003 RBP: 000000000000c669 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000000000 R13: 0000000000401c30 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6835: 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 3223: 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_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 The buggy address belongs to the object at ffff8801c4495240 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff8801c4495240, ffff8801c4495640) The buggy address belongs to the page: page:00000000474794d6 count:1 mapcount:0 mapping:000000002515fd1d index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c4494040 0000000000000000 0000000100000007 raw: ffffea0007129c20 ffffea000712b520 ffff8801db000ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c4495100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c4495180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801c4495200: fb fb fb fb fb fb fb fb fb fb fb fb 00 00 00 00 ^ ffff8801c4495280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c4495300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================