From c4bd411c35290f9568da44a7faf7a09505db78db Mon Sep 17 00:00:00 2001
From: Qiang Zhou <nju04zq@gmail.com>
Date: Thu, 19 Dec 2019 18:33:21 +0800
Subject: [PATCH] Fix decode fail on image with invalid eXIf chunk

---
 pngrutil.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pngrutil.c b/pngrutil.c
index 4db3de990..a825f148c 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -2079,7 +2079,7 @@ png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
       if (i == 1 && buf[0] != 'M' && buf[0] != 'I'
                  && info_ptr->eXIf_buf[0] != buf[0])
       {
-         png_crc_finish(png_ptr, length);
+         png_crc_finish(png_ptr, length-i-1);
          png_chunk_benign_error(png_ptr, "incorrect byte-order specifier");
          png_free(png_ptr, info_ptr->eXIf_buf);
          info_ptr->eXIf_buf = NULL;