mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings

mwifiex_update_vs_ie(),mwifiex_set_uap_rates() and
mwifiex_set_wmm_params() call memcpy() without checking
the destination size.Since the source is given from
user-space, this may trigger a heap buffer overflow.

Fix them by putting the length check before performing memcpy().

This fix addresses CVE-2019-14814,CVE-2019-14815,CVE-2019-14816.

Signed-off-by: Wen Huang <huangwenabc@gmail.com>
Acked-by: Ganapathi Bhat <gbhat@marvell.comg>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

2 files changed, 11 insertions, 1 deletions

diff --git a/drivers/net/wireless/marvell/mwifiex/ie.c b/drivers/net/wireless/marvell/mwifiex/ie.c
index 653d347a9a19..580387f9f12a 100644
--- a/drivers/net/wireless/marvell/mwifiex/ie.c
+++ b/drivers/net/wireless/marvell/mwifiex/ie.c
@@ -241,6 +241,9 @@ static int mwifiex_update_vs_ie(const u8 *ies, int ies_len,
                 }
 
                 vs_ie = (struct ieee_types_header *)vendor_ie;
+                if (le16_to_cpu(ie->ie_length) + vs_ie->len + 2 >
+                        IEEE_MAX_IE_SIZE)
+                        return -EINVAL;
                 memcpy(ie->ie_buffer + le16_to_cpu(ie->ie_length),
                        vs_ie, vs_ie->len + 2);
                 le16_unaligned_add_cpu(&ie->ie_length, vs_ie->len + 2);
diff --git a/drivers/net/wireless/marvell/mwifiex/uap_cmd.c b/drivers/net/wireless/marvell/mwifiex/uap_cmd.c
index 18f7d9bf30b2..0939a8c8f3ab 100644
--- a/drivers/net/wireless/marvell/mwifiex/uap_cmd.c
+++ b/drivers/net/wireless/marvell/mwifiex/uap_cmd.c
@@ -265,6 +265,8 @@ mwifiex_set_uap_rates(struct mwifiex_uap_bss_param *bss_cfg,
 
         rate_ie = (void *)cfg80211_find_ie(WLAN_EID_SUPP_RATES, var_pos, len);
         if (rate_ie) {
+                if (rate_ie->len > MWIFIEX_SUPPORTED_RATES)
+                        return;
                 memcpy(bss_cfg->rates, rate_ie + 1, rate_ie->len);
                 rate_len = rate_ie->len;
         }
@@ -272,8 +274,11 @@ mwifiex_set_uap_rates(struct mwifiex_uap_bss_param *bss_cfg,
         rate_ie = (void *)cfg80211_find_ie(WLAN_EID_EXT_SUPP_RATES,
                                            params->beacon.tail,
                                            params->beacon.tail_len);
-        if (rate_ie)
+        if (rate_ie) {
+                if (rate_ie->len > MWIFIEX_SUPPORTED_RATES - rate_len)
+                        return;
                 memcpy(bss_cfg->rates + rate_len, rate_ie + 1, rate_ie->len);
+        }
 
         return;
 }
@@ -391,6 +396,8 @@ mwifiex_set_wmm_params(struct mwifiex_private *priv,
                                             params->beacon.tail_len);
         if (vendor_ie) {
                 wmm_ie = vendor_ie;
+                if (*(wmm_ie + 1) > sizeof(struct mwifiex_types_wmm_info))
+                        return;
                 memcpy(&bss_cfg->wmm_info, wmm_ie +
                        sizeof(struct ieee_types_header), *(wmm_ie + 1));
                 priv->wmm_enabled = 1;