[PATCH] staging: wilc1000: fix illegal memory access in wilc_parse_join_bss_param()

[Ajay.Kathat]

From: Ajay Singh <ajay.kat...@microchip.com>

Do not copy the extended supported rates in 'param->supp_rates' if the
array is already full with basic rates values. The array size check
helped to avoid possible illegal memory access [1] while copying to
'param->supp_rates' array.

1. https://marc.info/?l=linux-next&m=157301720517456&w=2

Reported-by: coverity-bot <keescook+coverity-...@chromium.org>
Addresses-Coverity-ID: 1487400 ("Memory - illegal accesses")
Fixes: 4e0b0f42c9c7 ("staging: wilc1000: use struct to pack join parameters for 
FW")
Cc: sta...@vger.kernel.org
Signed-off-by: Ajay Singh <ajay.kat...@microchip.com>
---
 drivers/staging/wilc1000/hif.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/wilc1000/hif.c b/drivers/staging/wilc1000/hif.c
index 5f6706bcedf6..349e45d58ec9 100644
--- a/drivers/staging/wilc1000/hif.c
+++ b/drivers/staging/wilc1000/hif.c
@@ -485,16 +485,21 @@ void *wilc_parse_join_bss_param(struct cfg80211_bss *bss,
                memcpy(&param->supp_rates[1], rates_ie + 2, rates_len);
        }
 
-       supp_rates_ie = cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES, ies->data,
-                                        ies->len);
-       if (supp_rates_ie) {
-               if (supp_rates_ie[1] > (WILC_MAX_RATES_SUPPORTED - rates_len))
-                       param->supp_rates[0] = WILC_MAX_RATES_SUPPORTED;
-               else
-                       param->supp_rates[0] += supp_rates_ie[1];
-
-               memcpy(&param->supp_rates[rates_len + 1], supp_rates_ie + 2,
-                      (param->supp_rates[0] - rates_len));
+       if (rates_len < WILC_MAX_RATES_SUPPORTED) {
+               supp_rates_ie = cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES,
+                                                ies->data, ies->len);
+               if (supp_rates_ie) {
+                       u8 ext_rates = supp_rates_ie[1];
+
+                       if (ext_rates > (WILC_MAX_RATES_SUPPORTED - rates_len))
+                               param->supp_rates[0] = WILC_MAX_RATES_SUPPORTED;
+                       else
+                               param->supp_rates[0] += ext_rates;
+
+                       memcpy(&param->supp_rates[rates_len + 1],
+                              supp_rates_ie + 2,
+                              (param->supp_rates[0] - rates_len));
+               }
        }
 
        ht_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies->data, ies->len);
-- 
2.22.0

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