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From b62b942e805cdfdfd1e71ec752c08091d4c3229f Mon Sep 17 00:00:00 2001
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From: akallabeth <akallabeth@posteo.net>
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Date: Mon, 30 Mar 2020 18:05:17 +0200
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Subject: [PATCH] Fix CVE-2020-11524: out of bounds access in interleaved
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Thanks to Sunglin and HuanGMz from Knownsec 404
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---
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libfreerdp/codec/include/bitmap.c | 4 ++++
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libfreerdp/codec/interleaved.c | 2 +-
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2 files changed, 5 insertions(+), 1 deletion(-)
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diff --git a/libfreerdp/codec/include/bitmap.c b/libfreerdp/codec/include/bitmap.c
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index 602d1b333..734ed136d 100644
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--- a/libfreerdp/codec/include/bitmap.c
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+++ b/libfreerdp/codec/include/bitmap.c
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@@ -338,6 +338,10 @@ static INLINE BOOL RLEDECOMPRESS(const BYTE* pbSrcBuffer, UINT32 cbSrcBuffer,
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case MEGA_MEGA_COLOR_IMAGE:
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runLength = ExtractRunLength(code, pbSrc, &advance);
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pbSrc = pbSrc + advance;
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+
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+ if (!ENSURE_CAPACITY(pbDest, pbDestEnd, runLength))
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+ return FALSE;
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+
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UNROLL(runLength,
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{
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SRCREADPIXEL(temp, pbSrc);
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diff --git a/libfreerdp/codec/interleaved.c b/libfreerdp/codec/interleaved.c
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index a3fe7dd3f..0d36e9b9f 100644
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--- a/libfreerdp/codec/interleaved.c
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+++ b/libfreerdp/codec/interleaved.c
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@@ -215,7 +215,7 @@ static INLINE BOOL ensure_capacity(const BYTE* start, const BYTE* end, size_t si
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{
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const size_t available = (uintptr_t)end - (uintptr_t)start;
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const BOOL rc = available >= size * base;
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- return rc;
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+ return rc && (start <= end);
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}
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static INLINE void write_pixel_8(BYTE* _buf, BYTE _pix)
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--
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2.26.2
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