linux-kernel - [syzbot] KMSAN: uninit-value in hsr_fill_frame

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Message-ID: <000000000000d7639205eadb267a@google.com>
Date:   Wed, 12 Oct 2022 12:10:53 -0700
From:   syzbot <syzbot+b11c500e990cac6ba129@...kaller.appspotmail.com>
To:     claudiajkang@...il.com, davem@...emloft.net,
        ennoerlangen@...il.com, george.mccollister@...il.com,
        glider@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in hsr_fill_frame_info (2)

Hello,

syzbot found the following issue on:

HEAD commit:    d6e2c8c7eb40 x86: kmsan: enable KMSAN builds for x86
git tree:       https://github.com/google/kmsan.git master
console+strace: https://syzkaller.appspot.com/x/log.txt?x=143fe3c6f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=65d9eb7bfd2865c9
dashboard link: https://syzkaller.appspot.com/bug?extid=b11c500e990cac6ba129
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1257629ef00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17959c21f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b11c500e990cac6ba129@...kaller.appspotmail.com

hsr0: VLAN not yet supported
=====================================================
BUG: KMSAN: uninit-value in hsr_fill_frame_info+0x495/0x770 net/hsr/hsr_forward.c:526
 hsr_fill_frame_info+0x495/0x770 net/hsr/hsr_forward.c:526
 fill_frame_info net/hsr/hsr_forward.c:605 [inline]
 hsr_forward_skb+0x7c4/0x3630 net/hsr/hsr_forward.c:619
 hsr_dev_xmit+0x23a/0x530 net/hsr/hsr_device.c:222
 __netdev_start_xmit include/linux/netdevice.h:4778 [inline]
 netdev_start_xmit include/linux/netdevice.h:4792 [inline]
 xmit_one+0x2f4/0x840 net/core/dev.c:3532
 dev_hard_start_xmit+0x186/0x440 net/core/dev.c:3548
 __dev_queue_xmit+0x22ee/0x3500 net/core/dev.c:4176
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4209
 packet_snd net/packet/af_packet.c:3063 [inline]
 packet_sendmsg+0x6671/0x7d60 net/packet/af_packet.c:3094
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x9ef/0xc70 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0x19c/0x210 net/socket.c:2048
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 __kmalloc_node_track_caller+0xde3/0x14f0 mm/slub.c:4962
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1300 [inline]
 alloc_skb_with_frags+0x1df/0xd60 net/core/skbuff.c:5995
 sock_alloc_send_pskb+0xdf4/0xfc0 net/core/sock.c:2600
 packet_alloc_skb net/packet/af_packet.c:2911 [inline]
 packet_snd net/packet/af_packet.c:3006 [inline]
 packet_sendmsg+0x506f/0x7d60 net/packet/af_packet.c:3094
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 __sys_sendto+0x9ef/0xc70 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0x19c/0x210 net/socket.c:2048
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

CPU: 1 PID: 3506 Comm: syz-executor134 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


---
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