================================================================== BUG: KASAN: use-after-free in crypto_stat_skcipher_decrypt include/crypto/skcipher.h:510 [inline] BUG: KASAN: use-after-free in crypto_skcipher_decrypt include/crypto/skcipher.h:559 [inline] BUG: KASAN: use-after-free in _skcipher_recvmsg crypto/algif_skcipher.c:131 [inline] BUG: KASAN: use-after-free in skcipher_recvmsg+0x160f/0x1780 crypto/algif_skcipher.c:165 Read of size 4 at addr ffff8801b69239c0 by task syz-executor3/23539 CPU: 0 PID: 23539 Comm: syz-executor3 Not tainted 4.19.0+ #313 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 crypto_stat_skcipher_decrypt include/crypto/skcipher.h:510 [inline] crypto_skcipher_decrypt include/crypto/skcipher.h:559 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:131 [inline] skcipher_recvmsg+0x160f/0x1780 crypto/algif_skcipher.c:165 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 sock_read_iter+0x39b/0x570 net/socket.c:878 kvm [23531]: vcpu0, guest rIP: 0xfff0 unimplemented HWCR wrmsr: 0x80000280 call_read_iter include/linux/fs.h:1833 [inline] aio_read+0x297/0x490 fs/aio.c:1516 io_submit_one+0xac2/0xf80 fs/aio.c:1832 __do_sys_io_submit fs/aio.c:1916 [inline] __se_sys_io_submit fs/aio.c:1887 [inline] __x64_sys_io_submit+0x1b7/0x580 fs/aio.c:1887 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe binder: 23534:23545 ioctl c018620b 20000340 returned -14 RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f351c0cdc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000020bd9fe0 RSI: 0000000000000001 RDI: 00007f351c0ad000 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f351c0ce6d4 R13: 00000000004be72d R14: 00000000004ce600 R15: 00000000ffffffff Allocated by task 23539: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3722 [inline] __kmalloc+0x15b/0x760 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] sock_kmalloc+0x15a/0x1f0 net/core/sock.c:1984 af_alg_alloc_areq+0x83/0x280 crypto/af_alg.c:1097 _skcipher_recvmsg crypto/algif_skcipher.c:75 [inline] skcipher_recvmsg+0x354/0x1780 crypto/algif_skcipher.c:165 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 sock_read_iter+0x39b/0x570 net/socket.c:878 call_read_iter include/linux/fs.h:1833 [inline] aio_read+0x297/0x490 fs/aio.c:1516 io_submit_one+0xac2/0xf80 fs/aio.c:1832 __do_sys_io_submit fs/aio.c:1916 [inline] __se_sys_io_submit fs/aio.c:1887 [inline] __x64_sys_io_submit+0x1b7/0x580 fs/aio.c:1887 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 19019: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 __sock_kfree_s net/core/sock.c:2005 [inline] sock_kfree_s+0x29/0x60 net/core/sock.c:2011 af_alg_free_resources+0x6b/0x80 crypto/af_alg.c:1033 af_alg_async_cb+0xbc/0x180 crypto/af_alg.c:1056 cryptd_skcipher_complete+0x14c/0x250 crypto/cryptd.c:474 cryptd_skcipher_decrypt+0x4e2/0x750 crypto/cryptd.c:534 cryptd_queue_worker+0x12d/0x200 crypto/cryptd.c:193 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350 The buggy address belongs to the object at ffff8801b69236c0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 768 bytes inside of 1024-byte region [ffff8801b69236c0, ffff8801b6923ac0) The buggy address belongs to the page: page:ffffea0006da4880 count:1 mapcount:0 mapping:ffff8801da800ac0 index:0xffff8801b6922940 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea00070a7b08 ffffea00063a1608 ffff8801da800ac0 kvm [23547]: vcpu0, guest rIP: 0xfff0 unimplemented HWCR wrmsr: 0x80000280 raw: ffff8801b6922940 ffff8801b6922040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b6923880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b6923900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801b6923980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b6923a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b6923a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================