diff --git a/drivers/net/wireless/hostap/hostap_plx.c b/drivers/net/wireless/hostap/hostap_plx.c
index 6dfa041be66d..bc81b13a5a2a 100644
--- a/drivers/net/wireless/hostap/hostap_plx.c
+++ b/drivers/net/wireless/hostap/hostap_plx.c
@@ -364,7 +364,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
 
 	pos = 0;
 	while (pos < CIS_MAX_LEN - 1 && cis[pos] != CISTPL_END) {
-		if (pos + cis[pos + 1] >= CIS_MAX_LEN)
+		if (pos + 2 + cis[pos + 1] > CIS_MAX_LEN)
 			goto cis_error;
 
 		switch (cis[pos]) {
@@ -391,7 +391,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
 			break;
 
 		case CISTPL_MANFID:
-			if (cis[pos + 1] < 5)
+			if (cis[pos + 1] < 4)
 				goto cis_error;
 			manfid1 = cis[pos + 2] + (cis[pos + 3] << 8);
 			manfid2 = cis[pos + 4] + (cis[pos + 5] << 8);