# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1587013660 -10800
# Node ID 1ef7cdb8a5c1edc06a7ce3b6508199c7d21cc8a5
# Parent  2723cf62d039eda3f8f70a3d7341ce7870ccb907
Check that the source image has a palette when doing image -> palette conversion/extraction.

diff -r 2723cf62d039 -r 1ef7cdb8a5c1 tools/gfxconv.c
--- a/tools/gfxconv.c	Thu Apr 16 07:52:06 2020 +0300
+++ b/tools/gfxconv.c	Thu Apr 16 08:07:40 2020 +0300
@@ -2462,6 +2462,11 @@
                         break;
 
                     case FFMT_PALETTE:
+                        if (inImage->pal == NULL || inImage->pixfmt != DM_PIXFMT_PALETTE)
+                        {
+                            dmErrorMsg("Source image is not a paletted format or has no palette.\n");
+                            goto exit;
+                        }
                         res = dmWritePalette(optOutFilename, inImage->pal, &dmPaletteFormatList[optOutFormat]);
                         break;