Turbostat: check return value of vsnprintf

diff --git a/src/turbostat.c b/src/turbostat.c
index cc0be20..6fa172d 100644 (file)
--- a/src/turbostat.c
+++ b/src/turbostat.c
@@ -262,6 +262,7 @@ enum return_values {
        ERR_CPU_ALLOC,
        ERR_NOT_ROOT,
        UNSUPPORTED_CPU,
+       ERR_PATH_TOO_LONG,
 };
 
 
@@ -1069,11 +1070,16 @@ parse_int_file(const char *fmt, ...)
        va_list args;
        char path[PATH_MAX];
        FILE *filep;
-       int value;
+       int len, value;
 
        va_start(args, fmt);
-       vsnprintf(path, sizeof(path), fmt, args);
+       len = vsnprintf(path, sizeof(path), fmt, args);
        va_end(args);
+       if (len < 0 || len >= PATH_MAX) {
+               ERROR("Turbostat plugin: path truncated: '%s'", path);
+               return -ERR_PATH_TOO_LONG;
+       }
+
        filep = fopen(path, "r");
        if (!filep) {
                ERROR("Turbostat plugin: Failed to open '%s'", path);