regulatory: add NUL to request alpha2

[ Upstream commit 657308f73e674e86b60509a430a46e569bf02846 ]

Similar to the ancient commit a5fe8e7695dc ("regulatory: add NUL
to alpha2"), add another byte to alpha2 in the request struct so
that when we use nla_put_string(), we don't overrun anything.

Fixes: 73d54c9e74c4 ("cfg80211: add regulatory netlink multicast group")
Reported-by: Kees Cook <keescook@google.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/regulatory.h b/include/net/regulatory.h
index ebc5a2e..f83cacc 100644 (file)
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -78,7 +78,7 @@ struct regulatory_request {
        int wiphy_idx;
        enum nl80211_reg_initiator initiator;
        enum nl80211_user_reg_hint_type user_reg_hint_type;
-       char alpha2[2];
+       char alpha2[3];
        enum nl80211_dfs_regions dfs_region;
        bool intersect;
        bool processed;