protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 ================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2bd3/0x2f90 net/ipv4/tcp_timer.c:485 Read of size 8 at addr ffff88805d9d44b8 by task syz-fuzzer/7719 CPU: 1 PID: 7719 Comm: syz-fuzzer Not tainted 4.19.91-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 tcp_retransmit_timer+0x2bd3/0x2f90 net/ipv4/tcp_timer.c:485 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 tcp_write_timer_handler+0x513/0x900 net/ipv4/tcp_timer.c:598 tcp_write_timer+0x111/0x1d0 net/ipv4/tcp_timer.c:618 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697 protocol 88fb is buggy, dev hsr_slave_0 __do_softirq+0x25c/0x921 kernel/softirq.c:292 protocol 88fb is buggy, dev hsr_slave_1 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0033:0x4e049a Code: 8d 4b 01 48 89 4c 24 48 48 89 4c 24 08 e8 de fd ff ff 48 8b 44 24 10 48 8b 4c 24 30 48 39 c8 73 34 48 8b 54 24 50 48 8b 1c c2 <48> 8b 74 24 40 48 39 ce 72 9e eb 1f 48 89 44 24 78 48 89 8c 24 80 RSP: 002b:000000c434849750 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 RAX: 00000000000021e9 RBX: 00000000000020d9 RCX: 000000000000cc92 RDX: 000000c441540000 RSI: 000000000000cc92 RDI: 00000000007f87a0 RBP: 000000c4348497a8 R08: 0000000000000001 R09: 0000000000000001 R10: 000000c441540000 R11: 0000000000000006 R12: 00ffffffffffffff R13: 00000000000000ff R14: 00000000000000ff R15: 0000000000000002 Allocated by task 8278: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x700 mm/slab.c:3559 kmem_cache_zalloc include/linux/slab.h:699 [inline] net_alloc net/core/net_namespace.c:385 [inline] copy_net_ns+0xed/0x33c net/core/net_namespace.c:425 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2520 __do_sys_unshare kernel/fork.c:2588 [inline] __se_sys_unshare kernel/fork.c:2586 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2586 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8017: save_stack+0x45/0xd0 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:3503 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3765 net_free net/core/net_namespace.c:401 [inline] net_drop_ns+0x7e/0x90 net/core/net_namespace.c:408 cleanup_net+0x53b/0x960 net/core/net_namespace.c:571 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff88805d9d4280 which belongs to the cache net_namespace of size 8640 The buggy address is located 568 bytes inside of 8640-byte region [ffff88805d9d4280, ffff88805d9d6440) The buggy address belongs to the page: page:ffffea0001767500 count:1 mapcount:0 mapping:ffff88821bab2540 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea0002352008 ffffea000145c308 ffff88821bab2540 raw: 0000000000000000 ffff88805d9d4280 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805d9d4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805d9d4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805d9d4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805d9d4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805d9d4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================