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Date:   Wed, 12 Sep 2018 03:24:02 -0700
Message-ID: <0000000000004624c30575a9fd40@google.com>
Subject: KMSAN: uninit-value in pppoe_rcv
From:   syzbot <syzbot+f5f6080811c849739212@syzkaller.appspotmail.com>
To:     linux-kernel@vger.kernel.org, mostrows@earthlink.net,
        netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    d2d741e5d189 kmsan: add initialization for shmem pages
git tree:       https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=1465fc37800000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48f9de3384bcd0f
dashboard link: https://syzkaller.appspot.com/bug?extid=f5f6080811c849739212
compiler:       clang version 7.0.0 (trunk 329391)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14d6e607800000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10a15b5b800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f5f6080811c849739212@syzkaller.appspotmail.com

IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KMSAN: uninit-value in __get_item drivers/net/ppp/pppoe.c:172 [inline]
BUG: KMSAN: uninit-value in get_item drivers/net/ppp/pppoe.c:236 [inline]
BUG: KMSAN: uninit-value in pppoe_rcv+0xcef/0x10e0  
drivers/net/ppp/pppoe.c:450
CPU: 0 PID: 4543 Comm: syz-executor355 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x185/0x1d0 lib/dump_stack.c:53
  kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
  __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
  __get_item drivers/net/ppp/pppoe.c:172 [inline]
  get_item drivers/net/ppp/pppoe.c:236 [inline]
  pppoe_rcv+0xcef/0x10e0 drivers/net/ppp/pppoe.c:450
  __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4562
  __netif_receive_skb net/core/dev.c:4627 [inline]
  netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701
  netif_receive_skb+0x230/0x240 net/core/dev.c:4725
  tun_rx_batched drivers/net/tun.c:1555 [inline]
  tun_get_user+0x740f/0x7c60 drivers/net/tun.c:1962
  tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990
  call_write_iter include/linux/fs.h:1782 [inline]
  new_sync_write fs/read_write.c:469 [inline]
  __vfs_write+0x7fb/0x9f0 fs/read_write.c:482
  vfs_write+0x463/0x8d0 fs/read_write.c:544
  SYSC_write+0x172/0x360 fs/read_write.c:589
  SyS_write+0x55/0x80 fs/read_write.c:581
  do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4447c9
RSP: 002b:00007fff64c8fc28 EFLAGS: 00000297 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004447c9
RDX: 000000000000fd87 RSI: 0000000020000600 RDI: 0000000000000004
RBP: 00000000006cf018 R08: 00007fff64c8fda8 R09: 00007fff00006bda
R10: 0000000000005fe7 R11: 0000000000000297 R12: 00000000004020d0
R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
  kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
  kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
  kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
  slab_post_alloc_hook mm/slab.h:445 [inline]
  slab_alloc_node mm/slub.c:2737 [inline]
  __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
  __kmalloc_reserve net/core/skbuff.c:138 [inline]
  __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
  alloc_skb include/linux/skbuff.h:984 [inline]
  alloc_skb_with_frags+0x1d4/0xb20 net/core/skbuff.c:5234
  sock_alloc_send_pskb+0xb56/0x1190 net/core/sock.c:2085
  tun_alloc_skb drivers/net/tun.c:1532 [inline]
  tun_get_user+0x2242/0x7c60 drivers/net/tun.c:1829
  tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990
  call_write_iter include/linux/fs.h:1782 [inline]
  new_sync_write fs/read_write.c:469 [inline]
  __vfs_write+0x7fb/0x9f0 fs/read_write.c:482
  vfs_write+0x463/0x8d0 fs/read_write.c:544
  SYSC_write+0x172/0x360 fs/read_write.c:589
  SyS_write+0x55/0x80 fs/read_write.c:581
  do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================


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