netdev - Re: [PATCH net] skbuff: Unconditionally copy pfmemalloc in __skb

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Date:   Fri, 13 Jul 2018 14:28:06 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     sbrivio@...hat.com
Cc:     sd@...asysnail.net, mgorman@...e.de, eric.dumazet@...il.com,
        ptalbert@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] skbuff: Unconditionally copy pfmemalloc in
 __skb_clone()

From: Stefano Brivio <sbrivio@...hat.com>
Date: Fri, 13 Jul 2018 13:21:07 +0200

> Commit 8b7008620b84 ("net: Don't copy pfmemalloc flag in
> __copy_skb_header()") introduced a different handling for the
> pfmemalloc flag in copy and clone paths.
> 
> In __skb_clone(), now, the flag is set only if it was set in the
> original skb, but not cleared if it wasn't. This is wrong and
> might lead to socket buffers being flagged with pfmemalloc even
> if the skb data wasn't allocated from pfmemalloc reserves. Copy
> the flag instead of ORing it.
> 
> Reported-by: Sabrina Dubroca <sd@...asysnail.net>
> Fixes: 8b7008620b84 ("net: Don't copy pfmemalloc flag in __copy_skb_header()")
> Signed-off-by: Stefano Brivio <sbrivio@...hat.com>

Applied.