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From 561599c99f987dc32ae110370cfdd7df7975586b Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sat, 5 Feb 2022 20:36:41 +0100
Subject: [PATCH] TIFFReadDirectory(): avoid calling memcpy() with a null
source pointer and size of zero (fixes #362)
---
libtiff/tif_dirread.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: tiff-4.2.0/libtiff/tif_dirread.c
===================================================================
--- tiff-4.2.0.orig/libtiff/tif_dirread.c 2022-02-22 23:56:49.919326843 +0100
+++ tiff-4.2.0/libtiff/tif_dirread.c 2022-02-22 23:56:49.915326845 +0100
@@ -4173,7 +4173,8 @@
goto bad;
}
- memcpy(new_sampleinfo, tif->tif_dir.td_sampleinfo, old_extrasamples * sizeof(uint16));
+ if (old_extrasamples > 0)
+ memcpy(new_sampleinfo, tif->tif_dir.td_sampleinfo, old_extrasamples * sizeof(uint16));
_TIFFsetShortArray(&tif->tif_dir.td_sampleinfo, new_sampleinfo, tif->tif_dir.td_extrasamples);
_TIFFfree(new_sampleinfo);
}
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