[PATCH] hostap: Fix unlikely read overrun in CIS parsing

The Coverity checker (CID: 452, 453, 454, 455, 456) spotted this
unlikely read overrun of CIS buffer. Abort if CISTPL_CONFIG or
CISTPL_MANFID would not fit in buffer.

Signed-off-by: Jouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/hostap/hostap_plx.c

@@ -368,7 +368,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
 
 		switch (cis[pos]) {
 		case CISTPL_CONFIG:
-			if (cis[pos + 1] < 1)
+			if (cis[pos + 1] < 2)
 				goto cis_error;
 			rmsz = (cis[pos + 2] & 0x3c) >> 2;
 			rasz = cis[pos + 2] & 0x03;
@@ -390,7 +390,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
 			break;
 
 		case CISTPL_MANFID:
-			if (cis[pos + 1] < 4)
+			if (cis[pos + 1] < 5)
 				goto cis_error;
 			manfid1 = cis[pos + 2] + (cis[pos + 3] << 8);
 			manfid2 = cis[pos + 4] + (cis[pos + 5] << 8);