[PATCH v2 0/2] staging: Fix some warnings from strncpy()

[PATCH v2 0/2] staging: Fix some warnings from strncpy()

[Larry Finger]

When the size argument in a call to strncpy() is the size of the
destimation, gcc8 issues a warning. These patches fix the potential
problem.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>

v2 - The code is changed to implement the comments of David Laight.

Larry Finger (2):
  staging: rtl8192e: Fix compiler warning about strncpy
  staging: rtl8712u: Fix compiler warning about strncpy

 drivers/staging/rtl8192e/rtllib_softmac.c     | 4 ++--
 drivers/staging/rtl8712/rtl871x_ioctl_linux.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

-- 
2.18.0

[PATCH v2 1/2] staging: rtl8192e: Fix compiler warning from strncpy()

[Larry Finger]

When strncpy() is called with source and destination strings the same
length, gcc 8 warns that there may be an unterminated string. This section
is completely reworked to use the known lengths of the strings.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
---
v2 - David Laight's comments are implemented. 
---
 drivers/staging/rtl8192e/rtllib_softmac.c | 18 ++++++++++--------
 drivers/staging/rtl8192e/rtllib_softmac.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtllib_softmac.c b/drivers/staging/rtl8192e/rtllib_softmac.c
index 919231fec09c..287d0c11fa38 100644
--- a/drivers/staging/rtl8192e/rtllib_softmac.c
+++ b/drivers/staging/rtl8192e/rtllib_softmac.c
@@ -1680,19 +1680,19 @@ inline void rtllib_softmac_new_net(struct rtllib_device *ieee,
 		   (ssidbroad && !ssidset) || (!ssidbroad && ssidset))) ||
 		   (!apset && ssidset && ssidbroad && ssidmatch) ||
 		   (ieee->is_roaming && ssidset && ssidbroad && ssidmatch)) {
-			/* if the essid is hidden replace it with the
-			 * essid provided by the user.
+			/* Save the essid so that if it is hidden, it is
+			 * replaced with the essid provided by the user.
 			 */
 			if (!ssidbroad) {
-				strncpy(tmp_ssid, ieee->current_network.ssid,
-					IW_ESSID_MAX_SIZE);
+				memcpy(tmp_ssid, ieee->current_network.ssid,
+				       ieee->current_network.ssid_len);
 				tmp_ssid_len = ieee->current_network.ssid_len;
 			}
-			memcpy(&ieee->current_network, net,
-			       sizeof(struct rtllib_network));
+ 			memcpy(&ieee->current_network, net,
+ 			       sizeof(ieee->current_network));
 			if (!ssidbroad) {
-				strncpy(ieee->current_network.ssid, tmp_ssid,
-					IW_ESSID_MAX_SIZE);
+				memcpy(ieee->current_network.ssid, tmp_ssid,
+				       tmp_ssid_len);
 				ieee->current_network.ssid_len = tmp_ssid_len;
 			}
 			netdev_info(ieee->dev,
-- 
2.18.0

[PATCH v2 2/2] staging: rtl8712u: Fix compiler warning about strncpy

[Larry Finger]

When strncpy() is called with source and destination strings the same
length, gcc 8 warns that there may be an unterminated string. Using
strlcpy() rather than strncpy() forces a null at the end and quiets the
warning.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
---
v2 - No changes.
---
 drivers/staging/rtl8712/rtl871x_ioctl_linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
index c3ff7c3e6681..08e1c0957a07 100644
--- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
+++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c
@@ -1789,7 +1789,7 @@ static int r871x_wx_set_enc_ext(struct net_device *dev,
 		return -ENOMEM;
 	param->cmd = IEEE_CMD_SET_ENCRYPTION;
 	eth_broadcast_addr(param->sta_addr);
-	strncpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);
+	strlcpy((char *)param->u.crypt.alg, alg_name, IEEE_CRYPT_ALG_NAME_LEN);
 	if (pext->ext_flags & IW_ENCODE_EXT_GROUP_KEY)
 		param->u.crypt.set_tx = 0;
 	if (pext->ext_flags & IW_ENCODE_EXT_SET_TX_KEY)
-- 
2.18.0