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avcodec/siren: prevent getbitcontext overread

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Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Peter Ross <pross@xvid.org>
This commit is contained in:
Peter Ross 2021-09-18 19:55:03 +10:00
parent ed6549887a
commit b007e8968f
1 changed files with 5 additions and 1 deletions
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6
libavcodec/siren.c
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@ -608,12 +608,16 @@ static int decode_vector(SirenContext *s, int number_of_regions,
index >>= 1;
if (error == 0 && get_bits_left(gb) >= 0) {
if (error == 0) {
for (j = 0; j < vector_dimension[category]; j++) {
decoded_value = mlt_quant[category][index & ((1 << index_table[category]) - 1)];
index >>= index_table[category];
if (decoded_value) {
if (get_bits_left(gb) <= 0) {
error = 1;
break;
}
if (!get_bits1(gb))
decoded_value *= -decoder_standard_deviation[region];
else