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authorRoss Lagerwall <ross.lagerwall@citrix.com>2019-01-17 18:34:38 +0300
committerDavid S. Miller <davem@davemloft.net>2019-01-19 01:05:14 +0300
commit6c57f0458022298e4da1729c67bd33ce41c14e7a (patch)
treec56bc8518423b39cabbda138327a313262ea1e9e /drivers/net
parente40e2a2e78664fa90ea4b9bdf4a84efce2fea9d9 (diff)
downloadlinux-6c57f0458022298e4da1729c67bd33ce41c14e7a.tar.xz
net: Fix usage of pskb_trim_rcsum
In certain cases, pskb_trim_rcsum() may change skb pointers. Reinitialize header pointers afterwards to avoid potential use-after-frees. Add a note in the documentation of pskb_trim_rcsum(). Found by KASAN. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ppp/pppoe.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c
index 62dc564b251d..f22639f0116a 100644
--- a/drivers/net/ppp/pppoe.c
+++ b/drivers/net/ppp/pppoe.c
@@ -445,6 +445,7 @@ static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
if (pskb_trim_rcsum(skb, len))
goto drop;
+ ph = pppoe_hdr(skb);
pn = pppoe_pernet(dev_net(dev));
/* Note that get_item does a sock_hold(), so sk_pppox(po)