Commit 2f00300b authored by Michael Niedermayer's avatar Michael Niedermayer

avcodec/vp3: Check remaining bits in unpack_dct_coeffs()

Decreases the time spend decoding junk.

May fix: 1283/clusterfuzz-testcase-minimized-6221126759874560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpegSigned-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
parent b706ddba
......@@ -1071,6 +1071,9 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
s->dct_tokens[0][0] = s->dct_tokens_base;
if (get_bits_left(gb) < 16)
return AVERROR_INVALIDDATA;
/* fetch the DC table indexes */
dc_y_table = get_bits(gb, 4);
dc_c_table = get_bits(gb, 4);
......@@ -1080,6 +1083,8 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
0, residual_eob_run);
if (residual_eob_run < 0)
return residual_eob_run;
if (get_bits_left(gb) < 8)
return AVERROR_INVALIDDATA;
/* reverse prediction of the Y-plane DC coefficients */
reverse_dc_prediction(s, 0, s->fragment_width[0], s->fragment_height[0]);
......@@ -1102,6 +1107,8 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
s->fragment_width[1], s->fragment_height[1]);
}
if (get_bits_left(gb) < 8)
return AVERROR_INVALIDDATA;
/* fetch the AC table indexes */
ac_y_table = get_bits(gb, 4);
ac_c_table = get_bits(gb, 4);
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment