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diff --git a/third_party/libtiff/tif_dirread.c b/third_party/libtiff/tif_dirread.c
index a0dc68b..5ef3264 100644
--- a/third_party/libtiff/tif_dirread.c
+++ b/third_party/libtiff/tif_dirread.c
@@ -5372,6 +5372,8 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32 nstrips, uint64** lpp)
static const char module[] = "TIFFFetchStripThing";
enum TIFFReadDirEntryErr err;
uint64* data;
+ _TIFFfree(*lpp);
+ *lpp = 0;
err=TIFFReadDirEntryLong8Array(tif,dir,&data);
if (err!=TIFFReadDirEntryErrOk)
{