Jan Engelhardt
552f574b2f
- Add libwebp-double-free.patch: Avoid a double free, upstream commit a486d800 (bsc#1210212 CVE-2023-1999). OBS-URL: https://build.opensuse.org/request/show/1094314 OBS-URL: https://build.opensuse.org/package/show/graphics/libwebp?expand=0&rev=31
53 lines
1.8 KiB
Diff
53 lines
1.8 KiB
Diff
From a486d800b60d0af4cc0836bf7ed8f21e12974129 Mon Sep 17 00:00:00 2001
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From: James Zern <jzern@google.com>
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Date: Wed, 22 Feb 2023 22:15:47 -0800
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Subject: [PATCH] EncodeAlphaInternal: clear result->bw on error
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This avoids a double free should the function fail prior to
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VP8BitWriterInit() and a previous trial result's buffer carried over.
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Previously in ApplyFiltersAndEncode() trial.bw (with a previous
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iteration's buffer) would be freed, followed by best.bw pointing to the
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same buffer.
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Since:
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187d379d add a fallback to ALPHA_NO_COMPRESSION
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In addition, check the return value of VP8BitWriterInit() in this
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function.
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Bug: webp:603
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Change-Id: Ic258381ee26c8c16bc211d157c8153831c8c6910
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---
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src/enc/alpha_enc.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/src/enc/alpha_enc.c b/src/enc/alpha_enc.c
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index f7c02690e3..7d205586fe 100644
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--- a/src/enc/alpha_enc.c
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+++ b/src/enc/alpha_enc.c
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@@ -13,6 +13,7 @@
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#include <assert.h>
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#include <stdlib.h>
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+#include <string.h>
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#include "src/enc/vp8i_enc.h"
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#include "src/dsp/dsp.h"
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@@ -148,6 +149,7 @@ static int EncodeAlphaInternal(const uint8_t* const data, int width, int height,
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}
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} else {
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VP8LBitWriterWipeOut(&tmp_bw);
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+ memset(&result->bw, 0, sizeof(result->bw));
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return 0;
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}
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}
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@@ -162,7 +164,7 @@ static int EncodeAlphaInternal(const uint8_t* const data, int width, int height,
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header = method | (filter << 2);
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if (reduce_levels) header |= ALPHA_PREPROCESSED_LEVELS << 4;
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- VP8BitWriterInit(&result->bw, ALPHA_HEADER_LEN + output_size);
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+ if (!VP8BitWriterInit(&result->bw, ALPHA_HEADER_LEN + output_size)) ok = 0;
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ok = ok && VP8BitWriterAppend(&result->bw, &header, ALPHA_HEADER_LEN);
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ok = ok && VP8BitWriterAppend(&result->bw, output, output_size);
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