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From 06d20617d0d5bb89a6caf5f2201c93baf03c43c2 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
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Date: Mon, 10 Jun 2019 08:54:29 -0700
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Subject: [PATCH 05/11] CVE-2019-7577: Fix a buffer overread in MS_ADPCM_nibble
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and MS_ADPCM_decode If a chunk of RIFF/WAV file with MS ADPCM encoding
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contains an invalid predictor (a valid predictor's value is between 0 and 6
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inclusive), a buffer overread can happen when the predictor is used as an
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index into an array of MS ADPCM coefficients.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The overead happens when indexing MS_ADPCM_state.aCoeff[] array in
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MS_ADPCM_decode() and later when dereferencing a coef pointer in
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MS_ADPCM_nibble().
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This patch fixes it by checking the MS ADPCM predictor values fit
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into the valid range.
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CVE-2019-7577
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Reproducer: https://bugzilla.libsdl.org/show_bug.cgi?id=4492
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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--HG--
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branch : SDL-1.2
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---
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src/audio/SDL_wave.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/src/audio/SDL_wave.c b/src/audio/SDL_wave.c
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index 6c6eb14eb..3eedd20a1 100644
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--- a/src/audio/SDL_wave.c
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+++ b/src/audio/SDL_wave.c
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@@ -147,6 +147,9 @@ static int MS_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
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if ( stereo ) {
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state[1]->hPredictor = *encoded++;
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}
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+ if (state[0]->hPredictor >= 7 || state[1]->hPredictor >= 7) {
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+ goto invalid_predictor;
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+ }
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state[0]->iDelta = ((encoded[1]<<8)|encoded[0]);
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encoded += sizeof(Sint16);
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if ( stereo ) {
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@@ -217,6 +220,10 @@ too_short:
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SDL_SetError("Too short chunk for a MS ADPCM decoder");
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SDL_free(freeable);
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return(-1);
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+invalid_predictor:
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+ SDL_SetError("Invalid predictor value for a MS ADPCM decoder");
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+ SDL_free(freeable);
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+ return(-1);
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}
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struct IMA_ADPCM_decodestate {
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--
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2.21.0
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