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From f91c78960495efa04c7f12eeb916158d4bfbabc4 Mon Sep 17 00:00:00 2001
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From: Lumir Balhar <lbalhar@redhat.com>
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Date: Mon, 13 Jul 2020 15:40:11 +0200
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Subject: [PATCH] CVE-2020-11538
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---
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src/libImaging/SgiRleDecode.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/src/libImaging/SgiRleDecode.c b/src/libImaging/SgiRleDecode.c
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index 6367ae7..eb8fc84 100644
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--- a/src/libImaging/SgiRleDecode.c
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+++ b/src/libImaging/SgiRleDecode.c
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@@ -28,6 +28,7 @@ static void read4B(UINT32* dest, UINT8* buf)
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static int expandrow(UINT8* dest, UINT8* src, int n, int z, int xsize)
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{
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UINT8 pixel, count;
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+ int x = 0;
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for (;n > 0; n--)
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{
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@@ -37,9 +38,10 @@ static int expandrow(UINT8* dest, UINT8* src, int n, int z, int xsize)
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count = pixel & RLE_MAX_RUN;
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if (!count)
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return count;
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- if (count > xsize) {
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+ if (x + count > xsize) {
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return -1;
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}
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+ x += count;
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if (pixel & RLE_COPY_FLAG) {
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while(count--) {
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*dest = *src++;
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@@ -63,6 +65,7 @@ static int expandrow2(UINT16* dest, UINT16* src, int n, int z, int xsize)
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{
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UINT8 pixel, count;
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+ int x = 0;
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for (;n > 0; n--)
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{
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@@ -73,9 +76,10 @@ static int expandrow2(UINT16* dest, UINT16* src, int n, int z, int xsize)
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count = pixel & RLE_MAX_RUN;
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if (!count)
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return count;
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- if (count > xsize) {
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+ if (x + count > xsize) {
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return -1;
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}
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+ x += count;
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if (pixel & RLE_COPY_FLAG) {
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while(count--) {
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*dest = *src++;
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--
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2.26.2
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