linux-kernel - [PATCH] staging: rtl8723bs: hal: Fix memcpy calls

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Date:   Mon, 30 Sep 2019 14:01:41 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     devel@...verdev.osuosl.org
Cc:     Denis Efremov <efremov@...ux.com>, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Bastien Nocera <hadess@...ess.net>,
        Larry Finger <Larry.Finger@...inger.net>,
        Jes Sorensen <jes.sorensen@...il.com>, stable@...r.kernel.org
Subject: [PATCH] staging: rtl8723bs: hal: Fix memcpy calls

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@...uxfoundation.org>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Bastien Nocera <hadess@...ess.net>
Cc: Larry Finger <Larry.Finger@...inger.net>
Cc: Jes Sorensen <jes.sorensen@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Denis Efremov <efremov@...ux.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