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authorWillem de Bruijn <willemb@google.com>2015-03-11 15:43:55 -0400
committerDavid S. Miller <davem@davemloft.net>2015-03-12 00:09:55 -0400
commit3a8dd9711e0792f64394edafadd66c2d1f1904df (patch)
tree2b0f3746ed1049a0781d381791df55a24bcd73b6 /net
parentc29390c6dfeee0944ac6b5610ebbe403944378fc (diff)
downloadlinux-3a8dd9711e0792f64394edafadd66c2d1f1904df.tar.bz2
sock: fix possible NULL sk dereference in __skb_tstamp_tx
Test that sk != NULL before reading sk->sk_tsflags. Fixes: 49ca0d8bfaf3 ("net-timestamp: no-payload option") Reported-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/skbuff.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 434e78e5254d..8e4ac97c8477 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3733,9 +3733,13 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
struct sock *sk, int tstype)
{
struct sk_buff *skb;
- bool tsonly = sk->sk_tsflags & SOF_TIMESTAMPING_OPT_TSONLY;
+ bool tsonly;
- if (!sk || !skb_may_tx_timestamp(sk, tsonly))
+ if (!sk)
+ return;
+
+ tsonly = sk->sk_tsflags & SOF_TIMESTAMPING_OPT_TSONLY;
+ if (!skb_may_tx_timestamp(sk, tsonly))
return;
if (tsonly)