mwifiex: Fix possible buffer overflows in mwifiex_ret_wmm_get_status()
commit 3a9b153c5591548612c3955c9600a98150c81875 upstream.
mwifiex_ret_wmm_get_status() calls memcpy() without checking the
destination size.Since the source is given from remote AP which
contains illegal wmm elements , this may trigger a heap buffer
overflow.
Fix it by putting the length check before calling memcpy().
Signed-off-by: Qing Xu <m1s5p6688@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 67cefd0..00b2cb7 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -791,6 +791,10 @@
wmm_param_ie->qos_info_bitmap &
IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
+ if (wmm_param_ie->vend_hdr.len + 2 >
+ sizeof(struct ieee_types_wmm_parameter))
+ break;
+
memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
wmm_ie, wmm_param_ie,
wmm_param_ie->vend_hdr.len + 2);
