linux-kernel - Re: [PATCH net] qede: confirm skb is allocated before using

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Date:   Wed, 6 Apr 2022 23:02:12 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jamie Bainbridge <jamie.bainbridge@...il.com>
Cc:     Ariel Elior <aelior@...vell.com>,
        Manish Chopra <manishc@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Manish Chopra <manish.chopra@...ium.com>,
        Ariel Elior <ariel.elior@...ium.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] qede: confirm skb is allocated before using

On Wed,  6 Apr 2022 11:58:09 +1000 Jamie Bainbridge wrote:
> qede_build_skb() assumes build_skb() always works and goes straight
> to skb_reserve(). However, build_skb() can fail under memory pressure.
> This results in a kernel panic because the skb to reserve is NULL.
> 
> Add a check in case build_skb() failed to allocate and return NULL.
> 
> The NULL return is handled correctly in callers to qede_build_skb().
> 
> Fixes: 8a8633978b842 ("qede: Add build_skb() support.")
> Signed-off-by: Jamie Bainbridge <jamie.bainbridge@...il.com>

FTR commit 4e910dbe3650 ("qede: confirm skb is allocated before using")
in net.