[ESP]: Ensure IV is in linear part of the skb to avoid BUG() due to OOB access

ESP does not account for the IV size when calling pskb_may_pull() to
ensure everything it accesses directly is within the linear part of a
potential fragment. This results in a BUG() being triggered when the
both the IPv4 and IPv6 ESP stack is fed with an skb where the first
fragment ends between the end of the esp header and the end of the IV.

This bug was found by Dirk Nehring <dnehring@gmx.net> .

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index f3ceca31aa45..4e73e5708e70 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -336,7 +336,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
         struct scatterlist *asg;
         int err = -EINVAL;
 
-        if (!pskb_may_pull(skb, sizeof(*esph)))
+        if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)))
                 goto out;
 
         if (elen <= 0)
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 0ec1402320ea..c6bb4c6d24b3 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -282,7 +282,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
         struct scatterlist *sg;
         struct scatterlist *asg;
 
-        if (!pskb_may_pull(skb, sizeof(*esph))) {
+        if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) {
                 ret = -EINVAL;
                 goto out;
         }