debug.h: Handle overflow in debug().

diff --git a/src/debug.h b/src/debug.h
index 6456898cb7e601bb6fe987e3e4f6a39831f154cd..4dab03c3407600fad3556e498ca921ddf33a370d 100644 (file)
--- a/src/debug.h
+++ b/src/debug.h
@@ -33,6 +33,10 @@ static void debug(const char *format, ...) {
     va_start(ap, format);
     int written = vsnprintf(buffer, sizeof(buffer), format, ap);
     va_end(ap);
+    /* Overflow. */
+    if ((size_t)written >= sizeof(buffer)) {
+        written = sizeof(buffer) - 1;
+    }
 
     /* Make sure these functions are loaded. */
     DLSYM_FUNCTION(real_write, "write");