proc_parse: Make sure the fields in parsing stream do match

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

proc_parse.c

@@ -178,6 +178,7 @@ int parse_pid_stat(pid_t pid, int pid_dir, struct proc_pid_stat *s)
 {
 	FILE *f;
 	char *tok;
+	int n;
 
 	f = fopen_proc(pid_dir, "stat");
 	if (f == NULL) {
@@ -186,7 +187,7 @@ int parse_pid_stat(pid_t pid, int pid_dir, struct proc_pid_stat *s)
 	}
 
 	memset(s, 0, sizeof(*s));
-	fscanf(f,
+	n = fscanf(f,
 	       "%d " TASK_COMM_LEN_FMT " %c %d %d %d %d %d %u %lu %lu %lu %lu "
 	       "%lu %lu %ld %ld %ld %ld %d %d %llu %lu %ld %lu %lu %lu %lu "
 	       "%lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld "
@@ -239,6 +240,11 @@ int parse_pid_stat(pid_t pid, int pid_dir, struct proc_pid_stat *s)
 		&s->end_data,
 		&s->start_brk);
 
+	if (n != 47) {
+		pr_perror("Parsing %d's stat failed (#fields do not match)", pid);
+		return -1;
+	}
+
 	s->comm[TASK_COMM_LEN-1] = '\0';
 	tok = strchr(s->comm, ')');
 	if (tok)