From: Wen Huang Date: Wed, 28 Aug 2019 02:07:51 +0000 (+0800) Subject: mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings X-Git-Tag: v4.4.194~24 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=851224e62b5525f0a87a171905e5c144e1899cd2;p=thirdparty%2Fkernel%2Fstable.git mwifiex: Fix three heap overflow at parsing element in cfg80211_ap_settings commit 7caac62ed598a196d6ddf8d9c121e12e082cac3a upstream. 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 Acked-by: Ganapathi Bhat Signed-off-by: Kalle Valo Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/wireless/mwifiex/ie.c b/drivers/net/wireless/mwifiex/ie.c index de84357097352..4255fb8dd58ab 100644 --- a/drivers/net/wireless/mwifiex/ie.c +++ b/drivers/net/wireless/mwifiex/ie.c @@ -240,6 +240,9 @@ 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_add_cpu(&ie->ie_length, vs_ie->len + 2); diff --git a/drivers/net/wireless/mwifiex/uap_cmd.c b/drivers/net/wireless/mwifiex/uap_cmd.c index 759a6ada5b0fb..60bba1ca24e63 100644 --- a/drivers/net/wireless/mwifiex/uap_cmd.c +++ b/drivers/net/wireless/mwifiex/uap_cmd.c @@ -286,6 +286,8 @@ 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; } @@ -293,8 +295,11 @@ 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; } @@ -412,6 +417,8 @@ mwifiex_set_wmm_params(struct mwifiex_private *priv, params->beacon.tail_len); if (vendor_ie) { wmm_ie = (struct ieee_types_header *)vendor_ie; + if (*(vendor_ie + 1) > sizeof(struct mwifiex_types_wmm_info)) + return; memcpy(&bss_cfg->wmm_info, wmm_ie + 1, sizeof(bss_cfg->wmm_info)); priv->wmm_enabled = 1;