3.16.85-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Qing Xu <m1s5p6688@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> [bwh: Backported to 3.16: adjust filename] Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- drivers/net/wireless/mwifiex/wmm.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/net/wireless/mwifiex/wmm.c +++ b/drivers/net/wireless/mwifiex/wmm.c @@ -791,6 +791,10 @@ int mwifiex_ret_wmm_get_status(struct mw 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);
