Re: [PATCH net] ppp_synctty: ensure a writeable skb header

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Tue,  8 Sep 2026 15:21:31 +0800 you wrote:

ppp_sync_txmunge() checks headroom before prepending the address and
control bytes, but does not ensure that the skb header is writable.
A received skb can reach this function through PPP channel bridging
without passing through ppp_start_xmit(), which calls skb_cow_head().

For example, a PPPoE frame may share its buffer with a clone queued to
an AF_PACKET socket. If it is bridged to a synchronous tty channel, the
address/control bytes can overwrite data still visible to that socket.

[...]

Here is the summary with links:
  - [net] ppp_synctty: ensure a writeable skb header
    https://git.kernel.org/netdev/net/c/8aaeb56aff2a

You are awesome, thank you!
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