Use struct sctp_assoc_value instead ================================================================== 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 ffff8801d00eb19c by task syz-executor1/4324 CPU: 0 PID: 4324 Comm: syz-executor1 Not tainted 4.15.0-rc2+ #155 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:809 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:816 ___sys_recvmsg+0x29b/0x630 net/socket.c:2185 __sys_recvmsg+0xe2/0x210 net/socket.c:2230 SYSC_recvmsg net/socket.c:2242 [inline] SyS_recvmsg+0x2d/0x50 net/socket.c:2237 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a39 RSP: 002b:00007f6adfe3cc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39 RDX: 0000000000000002 RSI: 000000002022efc8 RDI: 0000000000000017 RBP: 0000000000000048 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee760 R13: 00000000ffffffff R14: 00007f6adfe3d6d4 R15: 0000000000000002 Allocated by task 3429: 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] crypto_rfc4543_init_tfm+0x59/0x200 crypto/gcm.c:1104 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:1454 SyS_bind+0x24/0x30 net/socket.c:1440 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 4298: 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_sock_destruct+0x13c/0x220 crypto/algif_aead.c:538 __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:1651 [inline] af_alg_release+0x5d/0x70 crypto/af_alg.c:126 sock_release+0x8d/0x1e0 net/socket.c:600 sock_close+0x16/0x20 net/socket.c:1129 __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 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x94/0x96 The buggy address belongs to the object at ffff8801d00eb180 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 28 bytes inside of 128-byte region [ffff8801d00eb180, ffff8801d00eb200) The buggy address belongs to the page: page:0000000075e49183 count:1 mapcount:0 mapping:000000000c083f0e index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d00eb000 0000000000000000 0000000100000015 raw: ffffea0007352da0 ffffea00073420e0 ffff8801db000640 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d00eb080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801d00eb100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801d00eb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d00eb200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801d00eb280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================