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skbuff: Unconditionally copy pfmemalloc in __skb_clone() 

Commit 8b7008620b ("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@queasysnail.net>
Fixes: 8b7008620b ("net: Don't copy pfmemalloc flag in __copy_skb_header()")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Tested-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2018-07-13 13:21:07 +02:00 committed by David S. Miller
parent 8f19f12bdc
commit e78bfb0751
1 changed files with 1 additions and 2 deletions
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3
net/core/skbuff.c
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@ -858,8 +858,7 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
n->cloned = 1;
n->nohdr = 0;
n->peeked = 0;
if (skb->pfmemalloc)
n->pfmemalloc = 1;
C(pfmemalloc);
n->destructor = NULL;
C(tail);
C(end);