[PATCH] drivers/net/wireless/iwlegacy: adding check length for parameter buf

[Chen Gang <gang.chen@asianux.com>]

  the parameter 'const char *buf' may be not '\0' based string.
  so need check the length before use it.

additinal info:
  originally, it had the relative checking.
  but it was deleted when fix another issues (using strlcpy instead of
strncpy)
  and now, we need restore the checking (but still keep strlcpy)

Signed-off-by: Chen Gang <gang.chen@asianux.com>
---
 drivers/net/wireless/iwlegacy/3945-mac.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/iwlegacy/3945-mac.c
b/drivers/net/wireless/iwlegacy/3945-mac.c
index 050ce7c..71cdbac 100644
--- a/drivers/net/wireless/iwlegacy/3945-mac.c
+++ b/drivers/net/wireless/iwlegacy/3945-mac.c
@@ -3273,7 +3273,7 @@ il3945_store_measurement(struct device *d, struct
device_attribute *attr,

 	if (count) {
 		char *p = buffer;
-		strlcpy(buffer, buf, sizeof(buffer));
+		strlcpy(buffer, buf, min(sizeof(buffer), count));
 		channel = simple_strtoul(p, NULL, 0);
 		if (channel)
 			params.channel = channel;
-- 
1.7.10.4