[PATCH] sotftmac: fix a slab corruption in WEP restricted key association

Fix a slab corruption in ieee80211softmac_auth(). The size of a buffer
was miscomputed.

see http://bugzilla.kernel.org/show_bug.cgi?id=7245

Acked-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Laurent Riffard <laurent.riffard@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/ieee80211/softmac/ieee80211softmac_io.c

@@ -304,7 +304,7 @@ ieee80211softmac_auth(struct ieee80211_auth **pkt,
 		2 +		/* Auth Transaction Seq */
 		2 +		/* Status Code */
 		 /* Challenge Text IE */
-		is_shared_response ? 0 : 1 + 1 + net->challenge_len
+		(is_shared_response ? 1 + 1 + net->challenge_len : 0)
 	);
 	if (unlikely((*pkt) == NULL))
 		return 0;