From 2e1b7b03f858664c4eb0014f50bebe71790cd7f5 Mon Sep 17 00:00:00 2001
From: Pierre Joye <pajoye@php.net>
Date: Wed, 11 Oct 2006 00:21:33 +0000
Subject: [PATCH] - don't check signature if the file is empty (valgrind
 reports with test   001), thx Tony for the head up

---
 ext/gd/libgd/gd_png.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ext/gd/libgd/gd_png.c b/ext/gd/libgd/gd_png.c
index 45ec475827..b5245bd6c4 100644
--- 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;
 	}
-- 
2.50.1