regulatory: add NUL to alpha2

alpha2 is defined as 2-chars array, but is used in multiple
places as string (e.g. with nla_put_string calls), which
might leak kernel data.

Solve it by simply adding an extra char for the NULL
terminator, making such operations safe.

Cc: stable@vger.kernel.org
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/regulatory.h b/include/net/regulatory.h
index 259992444e80ae0b88eaec4ff345d23fd8f81c75..dad7ab20a8cb204f08b2ecda724d5c1db5138ec8 100644 (file)
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -167,7 +167,7 @@ struct ieee80211_reg_rule {
 struct ieee80211_regdomain {
        struct rcu_head rcu_head;
        u32 n_reg_rules;
-       char alpha2[2];
+       char alpha2[3];
        enum nl80211_dfs_regions dfs_region;
        struct ieee80211_reg_rule reg_rules[];
 };