================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in queued_spin_trylock include/asm-generic/qspinlock.h:69 [inline] BUG: KASAN: use-after-free in do_raw_spin_trylock+0x82/0x270 kernel/locking/spinlock_debug.c:119 Read of size 4 at addr ffff88808f6d6f7c by task syz-executor3/12575 CPU: 0 PID: 12575 Comm: syz-executor3 Not tainted 5.0.0-rc2+ #14 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] queued_spin_trylock include/asm-generic/qspinlock.h:69 [inline] do_raw_spin_trylock+0x82/0x270 kernel/locking/spinlock_debug.c:119 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 __raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline] _raw_spin_trylock+0x1c/0x80 kernel/locking/spinlock.c:128 spin_trylock include/linux/spinlock.h:339 [inline] icmp_xmit_lock net/ipv4/icmp.c:219 [inline] icmp_send+0x582/0x1bc0 net/ipv4/icmp.c:665 ip_options_compile+0xdbe/0x1dd0 net/ipv4/ip_options.c:472 ip_rcv_options net/ipv4/ip_input.c:282 [inline] ip_rcv_finish_core.isra.0+0x7f6/0x1ee0 net/ipv4/ip_input.c:357 ip_rcv_finish+0xc3/0x2f0 net/ipv4/ip_input.c:412 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip_rcv+0xed/0x620 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0x160/0x210 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 netif_receive_skb_internal+0x11e/0x690 net/core/dev.c:5186 napi_frags_finish net/core/dev.c:5753 [inline] napi_gro_frags+0xd07/0xfe0 net/core/dev.c:5827 tun_get_user+0x2ec2/0x4150 drivers/net/tun.c:1975 dccp_close: ABORT with 1 bytes unread tun_chr_write_iter+0xbd/0x160 drivers/net/tun.c:2020 call_write_iter include/linux/fs.h:1862 [inline] do_iter_readv_writev+0x902/0xbc0 fs/read_write.c:680 nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. do_iter_write fs/read_write.c:956 [inline] do_iter_write+0x184/0x610 fs/read_write.c:937 vfs_writev+0x1ee/0x370 fs/read_write.c:1001 do_writev+0x11a/0x300 fs/read_write.c:1036 __do_sys_writev fs/read_write.c:1109 [inline] __se_sys_writev fs/read_write.c:1106 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1106 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457f51 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 b8 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fd9f71a3ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000020000036 RCX: 0000000000457f51 RDX: 0000000000000002 RSI: 00007fd9f71a3bf0 RDI: 00000000000000f0 RBP: 0000000020000000 R08: 00000000000000f0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd9f71a46d4 R13: 00000000004c6606 R14: 00000000004db860 R15: 00000000ffffffff Allocated by task 12578: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 user_path_at_empty+0x2f/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] ksys_chdir+0xaf/0x220 fs/open.c:439 __do_sys_chdir fs/open.c:461 [inline] __se_sys_chdir fs/open.c:459 [inline] __x64_sys_chdir+0x31/0x40 fs/open.c:459 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 12578: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 filename_lookup+0x359/0x530 fs/namei.c:2357 user_path_at_empty+0x43/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] ksys_chdir+0xaf/0x220 fs/open.c:439 __do_sys_chdir fs/open.c:461 [inline] __se_sys_chdir fs/open.c:459 [inline] __x64_sys_chdir+0x31/0x40 fs/open.c:459 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808f6d6a80 which belongs to the cache names_cache of size 4096 The buggy address is located 1276 bytes inside of 4096-byte region [ffff88808f6d6a80, ffff88808f6d7a80) The buggy address belongs to the page: page:ffffea00023db580 count:1 mapcount:0 mapping:ffff8880aa16adc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00025da308 ffffea00023db408 ffff8880aa16adc0 raw: 0000000000000000 ffff88808f6d6a80 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f6d6e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808f6d6e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808f6d6f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808f6d6f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808f6d7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================