commit c4bd411c35290f9568da44a7faf7a09505db78db
author Qiang Zhou <nju04zq@gmail.com> Thu Dec 19 18:33:21 2019 +0800
committer Cosmin Truta <ctruta@gmail.com> Sat Mar 13 02:10:50 2021 -0500
tree 210e4e5be898d8276aa4b707cb3789b3cab2d7bc
parent 2224c8ea7b901ba038fdeff13605a60563bd00d2

Fix decode fail on image with invalid eXIf chunk

pngrutil.c

diff --git a/pngrutil.c b/pngrutil.c
index 4db3de9..a825f14 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -2079,7 +2079,7 @@
       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;