3.16.74-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Wen Huang <huangwenabc@xxxxxxxxx>
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 <huangwenabc@xxxxxxxxx>
Acked-by: Ganapathi Bhat <gbhat@xxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
[bwh: Backported to 3.16: adjust filenames]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/net/wireless/mwifiex/ie.c | 3 +++
drivers/net/wireless/mwifiex/uap_cmd.c | 9 ++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
--- 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
}
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);
--- a/drivers/net/wireless/mwifiex/uap_cmd.c
+++ b/drivers/net/wireless/mwifiex/uap_cmd.c
@@ -247,6 +247,8 @@ mwifiex_set_uap_rates(struct mwifiex_uap
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;
}
@@ -254,8 +256,11 @@ mwifiex_set_uap_rates(struct mwifiex_uap
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;
}
@@ -373,6 +378,8 @@ mwifiex_set_wmm_params(struct mwifiex_pr
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;
