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Date: Sat, 08 Jun 2019 08:03:05 -0700 From: syzbot <syzbot+d8b02c920ae8f3e0be75@...kaller.appspotmail.com> To: davem@...emloft.net, glider@...gle.com, idosch@...lanox.com, ivan.khoronzhuk@...aro.org, jiri@...lanox.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, petrm@...lanox.com, syzkaller-bugs@...glegroups.com Subject: KMSAN: uninit-value in bcmp Hello, syzbot found the following crash on: HEAD commit: d062d017 usb-fuzzer: main usb gadget fuzzer driver git tree: kmsan console output: https://syzkaller.appspot.com/x/log.txt?x=119daa0ca00000 kernel config: https://syzkaller.appspot.com/x/.config?x=67ebf8b3cce62ce7 dashboard link: https://syzkaller.appspot.com/bug?extid=d8b02c920ae8f3e0be75 compiler: clang version 9.0.0 (/home/glider/llvm/clang 06d00afa61eef8f7f501ebdb4e8612ea43ec2d78) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14973970a00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1349a4e2a00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d8b02c920ae8f3e0be75@...kaller.appspotmail.com IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KMSAN: uninit-value in memcmp lib/string.c:865 [inline] BUG: KMSAN: uninit-value in bcmp+0x117/0x180 lib/string.c:887 CPU: 1 PID: 10480 Comm: syz-executor472 Not tainted 5.1.0-rc7+ #5 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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:619 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310 memcmp lib/string.c:865 [inline] bcmp+0x117/0x180 lib/string.c:887 __hw_addr_del_ex net/core/dev_addr_lists.c:123 [inline] __dev_mc_del+0x16c/0x690 net/core/dev_addr_lists.c:810 dev_mc_del+0x6d/0x80 net/core/dev_addr_lists.c:828 ip_mc_filter_del net/ipv4/igmp.c:1142 [inline] __igmp_group_dropped+0x260/0x1320 net/ipv4/igmp.c:1276 igmp_group_dropped net/ipv4/igmp.c:1306 [inline] ip_mc_down+0x1e7/0x3b0 net/ipv4/igmp.c:1714 inetdev_event+0x22d/0x1df0 net/ipv4/devinet.c:1534 notifier_call_chain kernel/notifier.c:93 [inline] __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x13d/0x240 kernel/notifier.c:401 call_netdevice_notifiers_info net/core/dev.c:1753 [inline] call_netdevice_notifiers_extack net/core/dev.c:1765 [inline] call_netdevice_notifiers net/core/dev.c:1779 [inline] dev_close_many+0x60d/0x9e0 net/core/dev.c:1522 rollback_registered_many+0x94a/0x2210 net/core/dev.c:8177 rollback_registered net/core/dev.c:8242 [inline] unregister_netdevice_queue+0x593/0xab0 net/core/dev.c:9289 unregister_netdevice include/linux/netdevice.h:2658 [inline] __tun_detach+0x21be/0x2b10 drivers/net/tun.c:727 tun_detach drivers/net/tun.c:744 [inline] tun_chr_close+0xda/0x1c0 drivers/net/tun.c:3443 __fput+0x4d1/0xbc0 fs/file_table.c:278 ____fput+0x37/0x40 fs/file_table.c:309 task_work_run+0x22e/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:166 [inline] prepare_exit_to_usermode+0x31d/0x420 arch/x86/entry/common.c:197 syscall_return_slowpath+0x90/0x5c0 arch/x86/entry/common.c:268 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x400f00 Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d cd 17 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 RSP: 002b:00007fff995e0ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400f00 RDX: 0000000020000c40 RSI: 0000000000008914 RDI: 0000000000000004 RBP: 00000000004a2470 R08: 0000000000000100 R09: 0000000000000100 R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401f80 R13: 0000000000402010 R14: 0000000000000000 R15: 0000000000000000 Local variable description: ----buf.i@...gmp_group_dropped Variable was created at: ip_mc_filter_del net/ipv4/igmp.c:1139 [inline] __igmp_group_dropped+0x170/0x1320 net/ipv4/igmp.c:1276 igmp_group_dropped net/ipv4/igmp.c:1306 [inline] ip_mc_down+0x1e7/0x3b0 net/ipv4/igmp.c:1714 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
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