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SubjectKMSAN: uninit-value in __copy_skb_header (3)
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Hello,

syzbot found the following crash on:

HEAD commit: 6f88939b kmsan: don't unpoison memory in do_read_cache_pag..
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=16f17da2e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360
dashboard link: https://syzkaller.appspot.com/bug?extid=47c1f21c8f16b76ba687
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1417c17ce00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e09b84e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+47c1f21c8f16b76ba687@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in __skb_dst_copy include/net/dst.h:279 [inline]
BUG: KMSAN: uninit-value in skb_dst_copy include/net/dst.h:285 [inline]
BUG: KMSAN: uninit-value in __copy_skb_header+0x2bf/0x720
net/core/skbuff.c:935
CPU: 0 PID: 11989 Comm: syz-executor450 Not tainted 5.4.0-rc5+ #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+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
__msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
__skb_dst_copy include/net/dst.h:279 [inline]
skb_dst_copy include/net/dst.h:285 [inline]
__copy_skb_header+0x2bf/0x720 net/core/skbuff.c:935
__skb_clone+0xa2/0x970 net/core/skbuff.c:987
skb_clone+0x402/0x5d0 net/core/skbuff.c:1455
do_one_broadcast net/netlink/af_netlink.c:1435 [inline]
netlink_broadcast_filtered+0xbec/0x1c10 net/netlink/af_netlink.c:1510
netlink_broadcast+0xf6/0x110 net/netlink/af_netlink.c:1534
uevent_net_broadcast_untagged lib/kobject_uevent.c:330 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline]
kobject_uevent_env+0x1c4e/0x27c0 lib/kobject_uevent.c:592
kobject_uevent+0x6f/0x80 lib/kobject_uevent.c:641
device_add+0x25a3/0x2df0 drivers/base/core.c:2201
hci_register_dev+0x61a/0xfd0 net/bluetooth/hci_core.c:3308
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:682 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:706 [inline]
hci_uart_tty_ioctl+0xe61/0x1140 drivers/bluetooth/hci_ldisc.c:760
tty_ioctl+0x23e2/0x3100 drivers/tty/tty_io.c:2666
do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46
ksys_ioctl fs/ioctl.c:713 [inline]
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
__x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x4412f9
Code: e8 fc ab 02 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd6393cca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412f9
RDX: 0000000000000001 RSI: 00000000400455c8 RDI: 0000000000000003
RBP: 000000000001cbad R08: 00000009004002c8 R09: 00000009004002c8
R10: 00000009004002c8 R11: 0000000000000246 R12: 0000000000402120
R13: 00000000004021b0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134
kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88
slab_alloc_node mm/slub.c:2799 [inline]
slab_alloc mm/slub.c:2808 [inline]
kmem_cache_alloc+0x8d9/0xd20 mm/slub.c:2813
skb_clone+0x326/0x5d0 net/core/skbuff.c:1448
do_one_broadcast net/netlink/af_netlink.c:1435 [inline]
netlink_broadcast_filtered+0xbec/0x1c10 net/netlink/af_netlink.c:1510
netlink_broadcast+0xf6/0x110 net/netlink/af_netlink.c:1534
uevent_net_broadcast_untagged lib/kobject_uevent.c:330 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline]
kobject_uevent_env+0x1c4e/0x27c0 lib/kobject_uevent.c:592
kobject_uevent+0x6f/0x80 lib/kobject_uevent.c:641
device_add+0x25a3/0x2df0 drivers/base/core.c:2201
hci_register_dev+0x61a/0xfd0 net/bluetooth/hci_core.c:3308
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:682 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:706 [inline]
hci_uart_tty_ioctl+0xe61/0x1140 drivers/bluetooth/hci_ldisc.c:760
tty_ioctl+0x23e2/0x3100 drivers/tty/tty_io.c:2666
do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46
ksys_ioctl fs/ioctl.c:713 [inline]
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
__x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
=====================================================


---
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@googlegroups.com.

syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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