From a28b2e1b23fc936989dc4bbc857e9a8a851c5ff0 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 8 Nov 2022 15:16:58 +0100
Subject: [PATCH] (CVE-2022-3970) TIFFReadRGBATileExt(): fix (unsigned) integer
 overflow on strips/tiles > 2 GB

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53137

 (cherry picked from commit 227500897dfb07fb7d27f7aa570050e62617e3be)
---
 libtiff/tif_getimage.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c
index b1f7cc95..00cd5510 100644
--- a/libtiff/tif_getimage.c
+++ b/libtiff/tif_getimage.c
@@ -3044,15 +3044,15 @@ TIFFReadRGBATileExt(TIFF* tif, uint32 col, uint32 row, uint32 * raster, int stop
         return( ok );
 
     for( i_row = 0; i_row < read_ysize; i_row++ ) {
-        memmove( raster + (tile_ysize - i_row - 1) * tile_xsize,
-                 raster + (read_ysize - i_row - 1) * read_xsize,
+        memmove( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize,
+                 raster + (size_t)(read_ysize - i_row - 1) * read_xsize,
                  read_xsize * sizeof(uint32) );
-        _TIFFmemset( raster + (tile_ysize - i_row - 1) * tile_xsize+read_xsize,
+        _TIFFmemset( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize+read_xsize,
                      0, sizeof(uint32) * (tile_xsize - read_xsize) );
     }
 
     for( i_row = read_ysize; i_row < tile_ysize; i_row++ ) {
-        _TIFFmemset( raster + (tile_ysize - i_row - 1) * tile_xsize,
+        _TIFFmemset( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize,
                      0, sizeof(uint32) * tile_xsize );
     }