general protection fault in veth_get_stats64

From: syzbot
Date: Wed Oct 02 2019 - 15:56:14 EST

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Hello,

syzbot found the following crash on:

HEAD commit: a32db7e1 Add linux-next specific files for 20191002
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=175ab7cd600000
kernel config: https://syzkaller.appspot.com/x/.config?x=599cf05035799eef
dashboard link: https://syzkaller.appspot.com/bug?extid=3f3e5e77d793c7a6fe6c
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f8b943600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16981a25600000

The bug was bisected to:

commit 84da111de0b4be15bd500deff773f5116f39f7be
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sat Sep 21 17:07:42 2019 +0000

Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17c55847600000
final crash: https://syzkaller.appspot.com/x/report.txt?x=14255847600000
console output: https://syzkaller.appspot.com/x/log.txt?x=10255847600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3f3e5e77d793c7a6fe6c@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 84da111de0b4 ("Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma")

RSP: 002b:00007fff0ba6c998 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004424a9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8605 Comm: syz-executor330 Not tainted 5.4.0-rc1-next-20191002 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:veth_stats_rx drivers/net/veth.c:322 [inline]
RIP: 0010:veth_get_stats64+0x523/0x900 drivers/net/veth.c:356
Code: 89 85 60 ff ff ff e8 6c 74 31 fd 49 63 c7 48 69 c0 c0 02 00 00 48 03 85 60 ff ff ff 48 8d b8 a0 01 00 00 48 89 fa 48 c1 ea 03 <42> 80 3c 32 00 0f 85 c9 02 00 00 48 8d b8 a8 01 00 00 48 8b 90 a0
RSP: 0018:ffff88809996ed00 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff84418daf
RDX: 0000000000000034 RSI: ffffffff84418e04 RDI: 00000000000001a0
RBP: ffff88809996ede0 R08: ffff888093182180 R09: ffffed1013202d6a
R10: ffffed1013202d69 R11: ffff888099016b4f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000001f4a880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 000000009a80b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
dev_get_stats+0x8e/0x280 net/core/dev.c:9220
rtnl_fill_stats+0x4d/0xac0 net/core/rtnetlink.c:1191
rtnl_fill_ifinfo+0x10ad/0x3af0 net/core/rtnetlink.c:1717
rtmsg_ifinfo_build_skb+0xc9/0x1a0 net/core/rtnetlink.c:3635
rtmsg_ifinfo_event.part.0+0x43/0xe0 net/core/rtnetlink.c:3667
rtmsg_ifinfo_event net/core/rtnetlink.c:3678 [inline]
rtmsg_ifinfo+0x8d/0xa0 net/core/rtnetlink.c:3676
__dev_notify_flags+0x235/0x2c0 net/core/dev.c:7757
rtnl_configure_link+0x175/0x250 net/core/rtnetlink.c:2968
__rtnl_newlink+0x10c4/0x16d0 net/core/rtnetlink.c:3285
rtnl_newlink+0x69/0xa0 net/core/rtnetlink.c:3325
rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:5386
netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5404
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x8a5/0xd60 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:658
___sys_sendmsg+0x803/0x920 net/socket.c:2312
__sys_sendmsg+0x105/0x1d0 net/socket.c:2357
__do_sys_sendmsg net/socket.c:2366 [inline]
__se_sys_sendmsg net/socket.c:2364 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2364
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4424a9
Code: e8 9c 07 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 3b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff0ba6c998 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004424a9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace cc6dec8a4962bfff ]---
RIP: 0010:veth_stats_rx drivers/net/veth.c:322 [inline]
RIP: 0010:veth_get_stats64+0x523/0x900 drivers/net/veth.c:356
Code: 89 85 60 ff ff ff e8 6c 74 31 fd 49 63 c7 48 69 c0 c0 02 00 00 48 03 85 60 ff ff ff 48 8d b8 a0 01 00 00 48 89 fa 48 c1 ea 03 <42> 80 3c 32 00 0f 85 c9 02 00 00 48 8d b8 a8 01 00 00 48 8b 90 a0
RSP: 0018:ffff88809996ed00 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff84418daf
RDX: 0000000000000034 RSI: ffffffff84418e04 RDI: 00000000000001a0
RBP: ffff88809996ede0 R08: ffff888093182180 R09: ffffed1013202d6a
R10: ffffed1013202d69 R11: ffff888099016b4f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000001f4a880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 000000009a80b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

Next message: syzbot: "KMSAN: uninit-value in read_rio"
Previous message: Jacek Anaszewski: "Re: [PATCH 4/5] leds: flash: Add devm_* functions to the flash class"
Next in thread: Willem de Bruijn: "Re: general protection fault in veth_get_stats64"
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