From: Bing Zhao Date: Wed, 8 Jan 2014 23:45:56 +0000 (-0800) Subject: mwifiex: fix potential buffer overflow in dt configuration X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=63791ccd4690e5c6b3f060bcd2b846e31bd0b423;p=linux-beck.git mwifiex: fix potential buffer overflow in dt configuration If cfgdata length exceeds the command buffer size we will end up getting buffer overflow problem. Fix it by checking the buffer size less the command header length. Reviewed-by: Paul Stewart Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/mwifiex/sta_cmd.c b/drivers/net/wireless/mwifiex/sta_cmd.c index 9c2404cd755f..9208a8816b80 100644 --- a/drivers/net/wireless/mwifiex/sta_cmd.c +++ b/drivers/net/wireless/mwifiex/sta_cmd.c @@ -1170,8 +1170,9 @@ int mwifiex_dnld_dt_cfgdata(struct mwifiex_private *priv, strncmp(prop->name, prefix, len)) continue; - /* property header is 6 bytes */ - if (prop && prop->value && prop->length > 6) { + /* property header is 6 bytes, data must fit in cmd buffer */ + if (prop && prop->value && prop->length > 6 && + prop->length <= MWIFIEX_SIZE_OF_CMD_BUFFER - S_DS_GEN) { ret = mwifiex_send_cmd_sync(priv, HostCmd_CMD_CFG_DATA, HostCmd_ACT_GEN_SET, 0, prop);