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1diff --git a/third_party/libtiff/tif_aux.c b/third_party/libtiff/tif_aux.c
2index 3ce3680..bc4ea01 100644
3--- a/third_party/libtiff/tif_aux.c
4+++ b/third_party/libtiff/tif_aux.c
5@@ -69,7 +69,7 @@ _TIFFCheckRealloc(TIFF* tif, void* buffer,
6 	/*
7 	 * XXX: Check for integer overflow.
8 	 */
9-	if (nmemb && elem_size && !_TIFFIfMultiplicationOverflow(nmemb, elem_size))
10+	if (nmemb > 0 && elem_size > 0 && !_TIFFIfMultiplicationOverflow(nmemb, elem_size))
11 		cp = _TIFFrealloc(buffer, bytes);
12
13 	if (cp == NULL) {
14