vma/util: ASAN problem fix.

Author: strike-kokhotnikov

src/vma/util/sys_vars.cpp

@@ -276,15 +276,21 @@ int mce_sys_var::hex_to_cpuset(char *start, cpu_set_t *cpu_set)
 int mce_sys_var::env_to_cpuset(char *orig_start, cpu_set_t *cpu_set)
 {
 	int ret;
-	char* start = strdup(orig_start); // save the caller string from strtok destruction.
+	CPU_ZERO(cpu_set);
+
+	int len = strlen(orig_start);
+	if (len == 2 && orig_start[0] == '-' && orig_start[1] == '1') {
+		return 0;
+	}
 
+	char *start = strdup(orig_start); // save the caller string from strtok destruction.
 	/*
 	 * We expect a hex number or comma delimited cpulist.  Check for 
 	 * starting characters of "0x" or "0X" and if present then parse
 	 * the string as a hexidecimal value, otherwise treat it as a 
 	 * cpulist.
 	 */
-	if ((strlen(start) > 2) &&
+	if ((len > 2) &&
 		(start[0] == '0') &&
 		((start[1] == 'x') || (start[1] == 'X'))) {
 		ret = hex_to_cpuset(start + 2, cpu_set);

src/vma/util/utils.cpp

@@ -414,13 +414,26 @@ int priv_read_file(const char *path, char *buf, size_t size, vlog_levels_t log_l
 
 int read_file_to_int(const char *path, int default_value)
 {
-	int value = -1;
-	std::ifstream file_stream(path);
-	if (!file_stream || !(file_stream >> value)) {
-		__log_warn("ERROR while getting int from from file %s, we'll use default %d", path, default_value);
-		return default_value;
+	int fd, sz;
+	char c[21] = {};
+
+	fd = open(path, O_RDONLY);
+	if (fd >= 0) {
+		sz = read(fd, c, 20);
+		if (sz > 0) {
+			int value;
+			c[sz] = '\0';
+			int n = sscanf(reinterpret_cast<const char *>(&c), "%d", &value);
+			if (n == 1) {
+				close(fd);
+				return value;
+			}
+		}
+		close(fd);
 	}
-	return value;
+
+	__log_warn("ERROR while getting int from from file %s, we'll use default %d", path, default_value);
+	return default_value;
 }
 
 int get_ifinfo_from_ip(const struct sockaddr& addr, char* ifname, uint32_t& ifflags)