mac80211: fix VHT MCS mask array overrun

The HT MCS mask has 9 bytes, the VHT one only has 8 streams.
Split the loops to handle this correctly.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 17b1fe961c5d..a30ec3ce3d25 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2518,15 +2518,17 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
                         continue;
 
                 for (j = 0; j < IEEE80211_HT_MCS_MASK_LEN; j++) {
-                        if (~sdata->rc_rateidx_mcs_mask[i][j])
+                        if (~sdata->rc_rateidx_mcs_mask[i][j]) {
                                 sdata->rc_has_mcs_mask[i] = true;
+                                break;
+                        }
+                }
 
-                        if (~sdata->rc_rateidx_vht_mcs_mask[i][j])
+                for (j = 0; j < NL80211_VHT_NSS_MAX; j++) {
+                        if (~sdata->rc_rateidx_vht_mcs_mask[i][j]) {
                                 sdata->rc_has_vht_mcs_mask[i] = true;
-
-                        if (sdata->rc_has_mcs_mask[i] &&
-                            sdata->rc_has_vht_mcs_mask[i])
                                 break;
+                        }
                 }
         }