[PATCH 3.16 248/366] skbuff: Unconditionally copy pfmemalloc in __skb_clone()

Ben Hutchings
2018-11-12T05:48:12Z

From: Stefano Brivio <sbrivio@redhat.com>

commit e78bfb0751d4e312699106ba7efbed2bab1a53ca upstream.

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@queasysnail.net>
Fixes: 8b7008620b84 ("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>
[bwh: Backported to 3.16: We didn't set the pfmemalloc flag in either copy
or clone path until now]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -768,6 +768,7 @@ static struct sk_buff *__skb_clone(struc
n->cloned = 1;
n->nohdr = 0;
n->peeked = 0;
+ C(pfmemalloc);
n->destructor = NULL;
C(tail);
C(end);