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batman-adv: properly check pskb_may_pull return value

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pskb_may_pull() returns 1 on success and 0 in case of failure,
therefore checking for the return value being negative does
not make sense at all.

This way if the function fails we will probably read beyond the current
skb data buffer. Fix this by doing the proper check.

Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
This commit is contained in:
Antonio Quartulli 2014-01-30 00:12:24 +01:00
parent 91c2b1a9f6
commit f1791425cf
1 changed files with 1 additions and 1 deletions
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2
net/batman-adv/routing.c
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@ -688,7 +688,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv,
int is_old_ttvn;
/* check if there is enough data before accessing it */
if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0)
if (!pskb_may_pull(skb, hdr_len + ETH_HLEN))
return 0;
/* create a copy of the skb (in case of for re-routing) to modify it. */