Re: [PATCH net v2] ppp: remove SC_MUST_COMP

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@xxxxxxxxxx>:

On Tue,  3 Nov 2026 09:56:11 +0800 you wrote:
> SC_MUST_COMP accidentally shares the same value with SC_DC_ERROR.
> PPPIOCGFLAGS combines configuration flags with transmit and receive
> state, so userspace cannot distinguish them, and a read-modify-write
> sequence can promote a decompression error into SC_MUST_COMP.
> 
> With SC_MUST_COMP set, intentional or not, a fatal decompression error
> (SC_DC_FERROR) causes the receive path to silently drop the failed
> packet before delivering it to userspace. pppd therefore cannot detect
> the error and reset the compressor's state. Subsequent incoming IP and
> CCP packets hit the same check and are also dropped, preventing normal
> recovery.
> 
> [...]

Here is the summary with links:
  - [net,v2] ppp: remove SC_MUST_COMP
    https://git.kernel.org/netdev/net-next/c/4bca33ba24db

You are awesome, thank you!
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