[FFmpeg-cvslog] avcodec/wmadec: Require previous exponents for reuse
Michael Niedermayer
git at videolan.org
Fri Nov 22 01:04:16 EET 2019
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Thu Oct 31 14:38:16 2019 +0100| [aca0578002d9492c998205b68263ddf443b00c53] | committer: Michael Niedermayer
avcodec/wmadec: Require previous exponents for reuse
Fixes: division by zero
Fixes: 18474/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAV2_fuzzer-5764986962182144
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c54b9fc42fee613e2c4c0dae2052ff94cd15e254)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=aca0578002d9492c998205b68263ddf443b00c53
---
libavcodec/wma.h | 1 +
libavcodec/wmadec.c | 3 +++
2 files changed, 4 insertions(+)
diff --git a/libavcodec/wma.h b/libavcodec/wma.h
index 325f03c44b..8344cb5b93 100644
--- a/libavcodec/wma.h
+++ b/libavcodec/wma.h
@@ -123,6 +123,7 @@ typedef struct WMACodecContext {
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
int last_bitoffset;
int last_superframe_len;
+ int exponents_initialized;
float noise_table[NOISE_TAB_SIZE];
int noise_index;
float noise_mult; /* XXX: suppress that and integrate it in the noise array */
diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index 78b51e5871..bb9bc8d236 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -587,6 +587,9 @@ static int wma_decode_block(WMACodecContext *s)
s->exponents_bsize[ch] = bsize;
}
}
+ s->exponents_initialized = 1;
+ }else if (!s->exponents_initialized) {
+ return AVERROR_INVALIDDATA;
}
/* parse spectral coefficients : just RLE encoding */
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