brcmfmac: add parameter check in brcmf_c_mkiovar()

This patch assures data is only appended in output buffer when
data is not NULL and datalen is not zero.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_common.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_common.c
index f6b862d7798..c45270a2a1d 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_common.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_common.c
@@ -80,8 +80,10 @@ brcmf_c_mkiovar(char *name, char *data, uint datalen, char *buf, uint buflen)
         strncpy(buf, name, buflen);
 
         /* append data onto the end of the name string */
-        memcpy(&buf[len], data, datalen);
-        len += datalen;
+        if (data && datalen) {
+                memcpy(&buf[len], data, datalen);
+                len += datalen;
+        }
 
         return len;
 }