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From a28b2e1b23fc936989dc4bbc857e9a8a851c5ff0 Mon Sep 17 00:00:00 2001
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From: Even Rouault <even.rouault@spatialys.com>
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Date: Tue, 8 Nov 2022 15:16:58 +0100
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Subject: [PATCH] (CVE-2022-3970) TIFFReadRGBATileExt(): fix (unsigned) integer
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overflow on strips/tiles > 2 GB
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Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53137
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(cherry picked from commit 227500897dfb07fb7d27f7aa570050e62617e3be)
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---
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libtiff/tif_getimage.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c
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index b1f7cc95..00cd5510 100644
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--- a/libtiff/tif_getimage.c
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+++ b/libtiff/tif_getimage.c
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@@ -3044,15 +3044,15 @@ TIFFReadRGBATileExt(TIFF* tif, uint32 col, uint32 row, uint32 * raster, int stop
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return( ok );
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for( i_row = 0; i_row < read_ysize; i_row++ ) {
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- memmove( raster + (tile_ysize - i_row - 1) * tile_xsize,
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- raster + (read_ysize - i_row - 1) * read_xsize,
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+ memmove( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize,
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+ raster + (size_t)(read_ysize - i_row - 1) * read_xsize,
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read_xsize * sizeof(uint32) );
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- _TIFFmemset( raster + (tile_ysize - i_row - 1) * tile_xsize+read_xsize,
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+ _TIFFmemset( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize+read_xsize,
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0, sizeof(uint32) * (tile_xsize - read_xsize) );
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}
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for( i_row = read_ysize; i_row < tile_ysize; i_row++ ) {
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- _TIFFmemset( raster + (tile_ysize - i_row - 1) * tile_xsize,
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+ _TIFFmemset( raster + (size_t)(tile_ysize - i_row - 1) * tile_xsize,
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0, sizeof(uint32) * tile_xsize );
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}
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