https://github.com/libsdl-org/libtiff/commit/efce8cf80ae935084e86b395bc215b73aa482c24
From efce8cf80ae935084e86b395bc215b73aa482c24 Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Sun, 6 Feb 2022 13:08:38 +0100
Subject: [PATCH] TIFFFetchStripThing(): avoid calling memcpy() with a null
source pointer and size of zero (fixes #362)
Backported from commit eecb0712f4c3a5b449f70c57988260a667ddbdef
---
libtiff/tif_dirread.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
index ba127ca9..b6a7d599 100644
--- a/libtiff/tif_dirread.c
+++ b/libtiff/tif_dirread.c
@@ -5765,7 +5765,8 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32 nstrips, uint64** lpp)
_TIFFfree(data);
return(0);
}
- _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
+ if (dir->tdir_count)
+ _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
_TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
_TIFFfree(data);
data=resizeddata;