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authorEric Dumazet <eric.dumazet@gmail.com>2010-12-05 18:50:32 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-10 16:20:56 -0800
commita19faf0250e09b16cac169354126404bc8aa342b (patch)
tree1d77cd6906181069ef3b5d1508c99c9a02f3e340 /net/core/timestamping.c
parentc710245caa41060e983cc9cb5ffcc020e02ca45f (diff)
net: fix skb_defer_rx_timestamp()
After commit c1f19b51d1d8 (net: support time stamping in phy devices.), kernel might crash if CONFIG_NETWORK_PHY_TIMESTAMPING=y and skb_defer_rx_timestamp() handles a packet without an ethernet header. Fixes kernel bugzilla #24102 Reference: https://bugzilla.kernel.org/show_bug.cgi?id=24102 Reported-and-tested-by: Andrew Watts <akwatts@ymail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/timestamping.c')
-rw-r--r--net/core/timestamping.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
index 0ae6c22da85..c19bb4ee405 100644
--- a/net/core/timestamping.c
+++ b/net/core/timestamping.c
@@ -96,11 +96,13 @@ bool skb_defer_rx_timestamp(struct sk_buff *skb)
struct phy_device *phydev;
unsigned int type;
- skb_push(skb, ETH_HLEN);
+ if (skb_headroom(skb) < ETH_HLEN)
+ return false;
+ __skb_push(skb, ETH_HLEN);
type = classify(skb);
- skb_pull(skb, ETH_HLEN);
+ __skb_pull(skb, ETH_HLEN);
switch (type) {
case PTP_CLASS_V1_IPV4: