================================================================== BUG: unable to handle kernel NULL pointer dereference at (null) IP: (null) PGD 1c817f067 P4D 1c817f067 PUD 1c875f067 PMD 0 Oops: 0010 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 6325 Comm: syz-executor2 Not tainted 4.15.0-rc1+ #203 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: 00000000a373274a task.stack: 000000008c7f3d3f RIP: 0010: (null) RSP: 0018:ffff8801d8fe7818 EFLAGS: 00010286 RAX: ffff8801c421c000 RBX: 1ffff1003b1fcf04 RCX: ffffffff823a8d7d RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8801d8fe7820 RBP: ffff8801d8fe79c0 R08: 0000000000000000 R09: ffff8801d78944d0 R10: 0000000000000008 R11: ffffed003af128a1 R12: ffff8801d251a918 R13: ffff8801c421c028 R14: ffff8801d8fe7820 R15: dffffc0000000000 FS: 00007f151d3a0700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001d784e000 CR4: 00000000001406f0 Call Trace: sock_recvmsg_nosec net/socket.c:805 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:812 sock_read_iter+0x361/0x560 net/socket.c:889 call_read_iter include/linux/fs.h:1766 [inline] aio_read+0x2b0/0x3a0 fs/aio.c:1501 io_submit_one fs/aio.c:1611 [inline] do_io_submit+0xf99/0x14f0 fs/aio.c:1682 SYSC_io_submit fs/aio.c:1707 [inline] SyS_io_submit+0x27/0x30 fs/aio.c:1704 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4529d9 RSP: 002b:00007f151d39fc58 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9 RDX: 0000000020bd9fe0 RSI: 0000000000000002 RDI: 00007f151d37e000 RBP: 0000000000000048 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed760 R13: 00000000ffffffff R14: 00007f151d3a06d4 R15: 0000000000000000 Code: Bad RIP value. RIP: (null) RSP: ffff8801d8fe7818 CR2: 0000000000000000 ---[ end trace fb0ef00c12d07cb7 ]--- Kernel panic - not syncing: Fatal exception BUG: KASAN: use-after-free in crypto_aead_alg include/crypto/aead.h:198 [inline] BUG: KASAN: use-after-free in crypto_aead_encrypt include/crypto/aead.h:330 [inline] BUG: KASAN: use-after-free in _aead_recvmsg crypto/algif_aead.c:308 [inline] BUG: KASAN: use-after-free in aead_recvmsg+0x1758/0x1bc0 crypto/algif_aead.c:329 Read of size 4 at addr ffff8801c421c01c by task syz-executor3/6324 CPU: 1 PID: 6324 Comm: syz-executor3 Tainted: G D 4.15.0-rc1+ #203 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_load4_noabort+0x14/0x20 mm/kasan/report.c:429 crypto_aead_alg include/crypto/aead.h:198 [inline] crypto_aead_encrypt include/crypto/aead.h:330 [inline] _aead_recvmsg crypto/algif_aead.c:308 [inline] aead_recvmsg+0x1758/0x1bc0 crypto/algif_aead.c:329 sock_recvmsg_nosec net/socket.c:805 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:812 sock_read_iter+0x361/0x560 net/socket.c:889 call_read_iter include/linux/fs.h:1766 [inline] aio_read+0x2b0/0x3a0 fs/aio.c:1501 io_submit_one fs/aio.c:1611 [inline] do_io_submit+0xf99/0x14f0 fs/aio.c:1682 SYSC_io_submit fs/aio.c:1707 [inline] SyS_io_submit+0x27/0x30 fs/aio.c:1704 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4529d9 RSP: 002b:00007f0bbd6bcc58 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9 RDX: 0000000020bd9fe0 RSI: 0000000000000002 RDI: 00007f0bbd69b000 RBP: 0000000000000048 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed760 R13: 00000000ffffffff R14: 00007f0bbd6bd6d4 R15: 0000000000000000 Allocated by task 6320: 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 __do_kmalloc mm/slab.c:3711 [inline] __kmalloc+0x162/0x760 mm/slab.c:3720 kmalloc include/linux/slab.h:504 [inline] kzalloc include/linux/slab.h:688 [inline] crypto_create_tfm+0x82/0x2e0 crypto/api.c:455 crypto_alloc_tfm+0x10e/0x2f0 crypto/api.c:540 crypto_alloc_skcipher+0x2c/0x40 crypto/skcipher.c:929 crypto_get_default_null_skcipher+0x5f/0x80 crypto/crypto_null.c:164 crypto_get_default_null_skcipher2 include/crypto/null.h:17 [inline] aead_init_geniv+0x164/0x310 crypto/aead.c:298 crypto_aead_init_tfm+0x11e/0x180 crypto/aead.c:102 crypto_create_tfm+0xdf/0x2e0 crypto/api.c:462 crypto_alloc_tfm+0x10e/0x2f0 crypto/api.c:540 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:1475 SyS_bind+0x24/0x30 net/socket.c:1461 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 6314: 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 kzfree+0x28/0x30 mm/slab_common.c:1482 crypto_destroy_tfm+0x140/0x2e0 crypto/api.c:581 crypto_free_skcipher include/crypto/skcipher.h:212 [inline] crypto_put_default_null_skcipher+0x35/0x60 crypto/crypto_null.c:185 crypto_put_default_null_skcipher2 include/crypto/null.h:22 [inline] aead_exit_geniv+0x40/0x50 crypto/aead.c:328 crypto_aead_exit_tfm+0x53/0x70 crypto/aead.c:88 crypto_exit_ops crypto/api.c:315 [inline] crypto_destroy_tfm+0xb9/0x2e0 crypto/api.c:579 crypto_free_aead include/crypto/aead.h:193 [inline] aead_release+0x30/0x50 crypto/algif_aead.c:505 alg_do_release crypto/af_alg.c:119 [inline] alg_sock_destruct+0x88/0xe0 crypto/af_alg.c:360 __sk_destruct+0xfd/0x910 net/core/sock.c:1558 sk_destruct+0x47/0x80 net/core/sock.c:1593 __sk_free+0x57/0x230 net/core/sock.c:1601 sk_free+0x2a/0x40 net/core/sock.c:1612 sock_put include/net/sock.h:1655 [inline] af_alg_release+0x5d/0x70 crypto/af_alg.c:126 sock_release+0x8d/0x1e0 net/socket.c:596 sock_close+0x16/0x20 net/socket.c:1125 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ae0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 entry_SYSCALL_64_fastpath+0x1f/0x96 The buggy address belongs to the object at ffff8801c421c000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 28 bytes inside of 128-byte region [ffff8801c421c000, ffff8801c421c080) The buggy address belongs to the page: page:00000000cf51183f count:1 mapcount:0 mapping:0000000020bf8fdb index:0xffff8801c421ce40 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c421c000 ffff8801c421ce40 0000000100000012 raw: ffffea000761df60 ffffea00070a75a0 ffff8801db000640 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c421bf00: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff8801c421bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801c421c000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c421c080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801c421c100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..