[PATCH] staging: rtl8723bs: hal: Fix memcpy calls

[Denis Efremov]

memcpy() in phy_ConfigBBWithParaFile() and PHY_ConfigRFWithParaFile() is
called with "src == NULL && len == 0". This is an undefined behavior.
Moreover this if pre-condition "pBufLen && (*pBufLen == 0) && !pBuf"
is constantly false because it is a nested if in the else brach, i.e.,
"if (cond) { ... } else { if (cond) {...} }". This patch alters the
if condition to check "pBufLen && pBuf" pointers are not NULL.

Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: Hans de Goede <hdegoede at redhat.com>
Cc: Bastien Nocera <hadess at hadess.net>
Cc: Larry Finger <Larry.Finger at lwfinger.net>
Cc: Jes Sorensen <jes.sorensen at gmail.com>
Cc: stable at vger.kernel.org
Signed-off-by: Denis Efremov <efremov at linux.com>
---
Not tested. I don't have the hardware. The fix is based on my guess.

 drivers/staging/rtl8723bs/hal/hal_com_phycfg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/hal/hal_com_phycfg.c b/drivers/staging/rtl8723bs/hal/hal_com_phycfg.c
index 6539bee9b5ba..0902dc3c1825 100644
--- a/drivers/staging/rtl8723bs/hal/hal_com_phycfg.c
+++ b/drivers/staging/rtl8723bs/hal/hal_com_phycfg.c
@@ -2320,7 +2320,7 @@ int phy_ConfigBBWithParaFile(
 			}
 		}
 	} else {
-		if (pBufLen && (*pBufLen == 0) && !pBuf) {
+		if (pBufLen && pBuf) {
 			memcpy(pHalData->para_file_buf, pBuf, *pBufLen);
 			rtStatus = _SUCCESS;
 		} else
@@ -2752,7 +2752,7 @@ int PHY_ConfigRFWithParaFile(
 			}
 		}
 	} else {
-		if (pBufLen && (*pBufLen == 0) && !pBuf) {
+		if (pBufLen && pBuf) {
 			memcpy(pHalData->para_file_buf, pBuf, *pBufLen);
 			rtStatus = _SUCCESS;
 		} else
-- 
2.21.0