================================================================== BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 Read of size 4 at addr ffff888093142690 by task syz-executor.2/11033 CPU: 0 PID: 11033 Comm: syz-executor.2 Not tainted 5.3.0-rc6+ #182 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:618 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 tcp_write_timer+0xa8/0x1e0 net/ipv4/tcp_timer.c:612 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:rmd128_transform+0x527/0x1520 crypto/rmd128.c:76 Code: 34 45 8d 34 39 89 7d ac 49 b9 00 00 00 00 00 fc ff df 49 8d 7d 38 45 01 e6 45 89 fc 49 89 fa 41 c1 c6 07 41 31 dc 49 c1 ea 03 <45> 31 f4 47 0f b6 14 0a 49 89 f9 41 83 e1 07 41 83 c1 03 45 38 d1 RSP: 0018:ffff88804d327780 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: ffff888099ec95b0 RBX: 000000003279575e RCX: 0000000000000007 RDX: 00000000d3df933e RSI: 0000000000000000 RDI: ffff888099ec95f8 RBP: ffff88804d327828 R08: 0000000000000000 R09: dffffc0000000000 R10: 1ffff110133d92bf R11: ffff888099ec95ff R12: 0000000001750914 R13: ffff888099ec95c0 R14: 00000000150b4e69 R15: 00000000330c5e4a rmd128_update+0xf2/0x170 crypto/rmd128.c:253 crypto_shash_update+0xc9/0x120 crypto/shash.c:120 shash_ahash_update+0xb6/0x120 crypto/shash.c:247 shash_async_update+0x1b/0x20 crypto/shash.c:255 crypto_ahash_update include/crypto/hash.h:534 [inline] hash_sendmsg+0x520/0xad0 crypto/algif_hash.c:102 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:657 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2311 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg net/socket.c:2439 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2439 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4dd4a01c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459879 RDX: 0000000000000001 RSI: 0000000020006dc0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4dd4a026d4 R13: 00000000004c7077 R14: 00000000004dc700 R15: 00000000ffffffff Allocated by task 9961: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:493 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:466 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:501 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 kmem_cache_zalloc include/linux/slab.h:738 [inline] net_alloc net/core/net_namespace.c:410 [inline] copy_net_ns+0xf1/0x41f net/core/net_namespace.c:462 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:202 ksys_unshare+0x444/0x980 kernel/fork.c:2831 __do_sys_unshare kernel/fork.c:2899 [inline] __se_sys_unshare kernel/fork.c:2897 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2897 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15004: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:455 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3693 net_free net/core/net_namespace.c:438 [inline] net_drop_ns.part.0+0x70/0x90 net/core/net_namespace.c:445 net_drop_ns net/core/net_namespace.c:444 [inline] cleanup_net+0x774/0xa60 net/core/net_namespace.c:613 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880931420c0 which belongs to the cache net_namespace of size 6784 The buggy address is located 1488 bytes inside of 6784-byte region [ffff8880931420c0, ffff888093143b40) The buggy address belongs to the page: page:ffffea00024c5080 refcount:1 mapcount:0 mapping:ffff8880a9ddd000 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffff8880a998cb48 ffffea0002621308 ffff8880a9ddd000 raw: 0000000000000000 ffff8880931420c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093142580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093142600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888093142680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093142700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093142780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================