| diff --git a/third_party/libtiff/tif_aux.c b/third_party/libtiff/tif_aux.c | |
| index 3ce3680..bc4ea01 100644 | |
| --- a/third_party/libtiff/tif_aux.c | |
| +++ b/third_party/libtiff/tif_aux.c | |
| @@ -69,7 +69,7 @@ _TIFFCheckRealloc(TIFF* tif, void* buffer, | |
| /* | |
| * XXX: Check for integer overflow. | |
| */ | |
| - if (nmemb && elem_size && !_TIFFIfMultiplicationOverflow(nmemb, elem_size)) | |
| + if (nmemb > 0 && elem_size > 0 && !_TIFFIfMultiplicationOverflow(nmemb, elem_size)) | |
| cp = _TIFFrealloc(buffer, bytes); | |
| if (cp == NULL) { |