cfg80211: add two missing NULL pointer checks
Johannes Berg [Wed, 29 Jul 2009 20:07:44 +0000 (22:07 +0200)]
These pointers can be NULL, the is_mesh() case isn't
ever hit in the current kernel, but cmp_ies() can be
hit under certain conditions.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@kernel.org [2.6.29, 2.6.30]
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/scan.c

index 9271118..7e595ce 100644 (file)
@@ -118,7 +118,7 @@ static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
 
        if (!ie1 && !ie2)
                return 0;
-       if (!ie1)
+       if (!ie1 || !ie2)
                return -1;
 
        r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
@@ -171,6 +171,8 @@ static bool is_mesh(struct cfg80211_bss *a,
        ie = find_ie(WLAN_EID_MESH_CONFIG,
                     a->information_elements,
                     a->len_information_elements);
+       if (!ie)
+               return false;
        if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
                return false;