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| author | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-10 16:59:42 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-10 17:23:51 +0100 |
| commit | 030c7f0309ec0e3cadb990408b4bb9b7fd739425 (patch) | |
| tree | 10b9492392e6551e98d8da27102889d782aebdaa | |
| parent | 79061bcec121c8f314a10ec8ba47736ed3073450 (diff) | |
| download | ffmpeg-030c7f0309ec0e3cadb990408b4bb9b7fd739425.tar.gz | |
avcodec/g2meet: Check for ff_els_decode_bit() failure in epic_decode_run_length()
Fixes invalid shift
Fixes: g2m_left_shift_2.wmv
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/g2meet.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c index 2815704997..51e8bbcd7b 100644 --- a/libavcodec/g2meet.c +++ b/libavcodec/g2meet.c @@ -631,6 +631,8 @@ static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width, (NN != N) << 1 | (NNW != NW); WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]); + if (WWneW < 0) + return WWneW; } if (WWneW) @@ -837,10 +839,13 @@ static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height, if (y < 2 || x < 2 || x == tile_width - 1) { run = 1; got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix); - } else + } else { got_pixel = epic_decode_run_length(dc, x, y, tile_width, curr_row, above_row, above2_row, &pix, &run); + if (got_pixel < 0) + return got_pixel; + } if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run, tile_width, curr_row, |