- don't check signature if the file is empty (valgrind reports with test

  001), thx Tony for the head up

diff --git a/ext/gd/libgd/gd_png.c b/ext/gd/libgd/gd_png.c
index fcc9a008abe80450014505020dd5ae72f4d4047f..b99c33c8c261757454e73bddbf65e40dd705a0e3 100644 (file)
--- a/ext/gd/libgd/gd_png.c
+++ b/ext/gd/libgd/gd_png.c
@@ -131,7 +131,10 @@ gdImagePtr gdImageCreateFromPngCtx (gdIOCtx * infile)
          /* first do a quick check that the file really is a PNG image; could
           * have used slightly more general png_sig_cmp() function instead
           */
-       gdGetBuf(sig, 8, infile);
+       if (gdGetBuf(sig, 8, infile) < 8) {
+               return NULL;
+       }
+
        if (!png_check_sig (sig, 8)) { /* bad signature */
                return NULL;
        }