Re: [PATCH net] pptp: ensure minimal skb length in pptp_xmit()

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 29 Jul 2025 08:02:07 +0000 you wrote:
> Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data
> on ppp_sync_txmung") fixed ppp_sync_txmunge()
> 
> We need a similar fix in pptp_xmit(), otherwise we might
> read uninit data as reported by syzbot.
> 
> BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193
>   pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193
>   ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]
>   ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314
>   pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379
>   sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148
>   __release_sock+0x1d3/0x330 net/core/sock.c:3213
>   release_sock+0x6b/0x270 net/core/sock.c:3767
>   pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904
>   sock_sendmsg_nosec net/socket.c:712 [inline]
>   __sock_sendmsg+0x330/0x3d0 net/socket.c:727
>   ____sys_sendmsg+0x893/0xd80 net/socket.c:2566
>   ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620
>   __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709
> 
> [...]

Here is the summary with links:
  - [net] pptp: ensure minimal skb length in pptp_xmit()
    https://git.kernel.org/netdev/net/c/de9c4861fb42

You are awesome, thank you!
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