[FFmpeg-devel] [PATCH 3/3] avcodec/wmadec: Keep track of exponent initialization per channel
Michael Niedermayer
michael at niedermayer.cc
Sat Nov 30 22:26:58 EET 2019
Fixes: division by 0
Fixes: 19123/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAV2_fuzzer-5655493121146880
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/wma.h | 2 +-
libavcodec/wmadec.c | 9 ++++++---
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/libavcodec/wma.h b/libavcodec/wma.h
index 8344cb5b93..c7fcf5047c 100644
--- a/libavcodec/wma.h
+++ b/libavcodec/wma.h
@@ -123,7 +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;
+ int exponents_initialized[MAX_CHANNELS];
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 bb9bc8d236..6365fe7f47 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -585,11 +585,14 @@ static int wma_decode_block(WMACodecContext *s)
decode_exp_lsp(s, ch);
}
s->exponents_bsize[ch] = bsize;
+ s->exponents_initialized[ch] = 1;
}
}
- s->exponents_initialized = 1;
- }else if (!s->exponents_initialized) {
- return AVERROR_INVALIDDATA;
+ }
+
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ if (s->channel_coded[ch] && !s->exponents_initialized[ch])
+ return AVERROR_INVALIDDATA;
}
/* parse spectral coefficients : just RLE encoding */
--
2.23.0
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