netdev - Re: [PATCH bpf] xsk: Free skb when TX metadata options are invalid

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Message-ID: <87jzd6q7q4.fsf@toke.dk>
Date: Thu, 14 Nov 2024 14:13:07 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Felix Maurer <fmaurer@...hat.com>, bpf@...r.kernel.org
Cc: bjorn@...nel.org, magnus.karlsson@...el.com,
 maciej.fijalkowski@...el.com, jonathan.lemon@...il.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, ast@...nel.org, daniel@...earbox.net,
 hawk@...nel.org, john.fastabend@...il.com, yoong.siang.song@...el.com,
 sdf@...ichev.me, netdev@...r.kernel.org, Michal Schmidt
 <mschmidt@...hat.com>
Subject: Re: [PATCH bpf] xsk: Free skb when TX metadata options are invalid

Felix Maurer <fmaurer@...hat.com> writes:

> When a new skb is allocated for transmitting an xsk descriptor, i.e., for
> every non-multibuf descriptor or the first frag of a multibuf descriptor,
> but the descriptor is later found to have invalid options set for the TX
> metadata, the new skb is never freed. This can leak skbs until the send
> buffer is full which makes sending more packets impossible.
>
> Fix this by freeing the skb in the error path if we are currently dealing
> with the first frag, i.e., an skb allocated in this iteration of
> xsk_build_skb.
>
> Fixes: 48eb03dd2630 ("xsk: Add TX timestamp and TX checksum offload support")
> Reported-by: Michal Schmidt <mschmidt@...hat.com>
> Signed-off-by: Felix Maurer <fmaurer@...hat.com>

Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>