net/wireless/nl80211.c: Avoid call to genlmsg_cancel

genlmsg_cancel subtracts some constants from its second argument before
calling nlmsg_cancel.  nlmsg_cancel then calls nlmsg_trim on the same
arguments.  nlmsg_trim tests for NULL before doing any computation, but a
NULL second argument to genlmsg_cancel is no longer NULL due to the initial
subtraction.  Nothing else happens in this execution, so the call to
genlmsg_cancel is simply unnecessary in this case.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression data;
@@

if (data == NULL) { ...
* genlmsg_cancel(..., data);
  ...
  return ...;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9b62710..864ddfb 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2718,7 +2718,7 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
        hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
                             NL80211_CMD_GET_MESH_CONFIG);
        if (!hdr)
-               goto nla_put_failure;
+               goto out;
        pinfoattr = nla_nest_start(msg, NL80211_ATTR_MESH_CONFIG);
        if (!pinfoattr)
                goto nla_put_failure;
@@ -2759,6 +2759,7 @@ static int nl80211_get_mesh_config(struct sk_buff *skb,
 
  nla_put_failure:
        genlmsg_cancel(msg, hdr);
+ out:
        nlmsg_free(msg);
        return -ENOBUFS;
 }
@@ -2954,7 +2955,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
        hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
                             NL80211_CMD_GET_REG);
        if (!hdr)
-               goto nla_put_failure;
+               goto put_failure;
 
        NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2,
                cfg80211_regdomain->alpha2);
@@ -3001,6 +3002,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 
 nla_put_failure:
        genlmsg_cancel(msg, hdr);
+put_failure:
        nlmsg_free(msg);
        err = -EMSGSIZE;
 out: