Fix memory over bound bug in cifs_parse_mount_options for 2.6.23

sources/2.6.23/connect.c

@@ -771,8 +771,7 @@ static int
 cifs_parse_mount_options(char *options, const char *devname,
 			 struct smb_vol *vol)
 {
-	char *value;
-	char *data;
+	char *value, *data, *end;
 	unsigned int  temp_len, i, j;
 	char separator[2];
 
@@ -810,6 +809,7 @@ cifs_parse_mount_options(char *options, const char *devname,
 	if (!options)
 		return 1;
 
+	end = options + strlen(options);
 	if (strncmp(options, "sep=", 4) == 0) {
 		if (options[4] != 0) {
 			separator[0] = options[4];
@@ -874,6 +874,7 @@ cifs_parse_mount_options(char *options, const char *devname,
 			the only illegal character in a password is null */
 
 			if ((value[temp_len] == 0) &&
+			    (value + temp_len < end) &&
 			    (value[temp_len+1] == separator[0])) {
 				/* reinsert comma */
 				value[temp_len] = separator[0];