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Fix invalid incremental decoding check.

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(cherry picked from commit 95ea5226c8)

Change-Id: I80c2165aa9fdf43077db155d2d00e0e99db73eab
This commit is contained in:
Vincent Rabaud
2023-10-03 14:44:39 +02:00
parent a298d9d127
commit bbaaf8dbef
1 changed files with 13 additions and 2 deletions
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15
src/dec/vp8l_dec.c
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@@ -1237,9 +1237,20 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
} }
br->eos_ = VP8LIsEndOfStream(br); br->eos_ = VP8LIsEndOfStream(br);
if (dec->incremental_ && br->eos_ && src < src_end) { // In incremental decoding:
// br->eos_ && src < src_last: if 'br' reached the end of the buffer and
// 'src_last' has not been reached yet, there is not enough data. 'dec' has to
// be reset until there is more data.
// !br->eos_ && src < src_last: this cannot happen as either the buffer is
// fully read, either enough has been read to reach 'src_last'.
// src >= src_last: 'src_last' is reached, all is fine. 'src' can actually go
// beyond 'src_last' in case the image is cropped and an LZ77 goes further.
// The buffer might have been enough or there is some left. 'br->eos_' does
// not matter.
assert(!dec->incremental_ || (br->eos_ && src < src_last) || src >= src_last);
if (dec->incremental_ && br->eos_ && src < src_last) {
RestoreState(dec); RestoreState(dec);
} else if (!br->eos_) { } else if ((dec->incremental_ && src >= src_last) || !br->eos_) {
// Process the remaining rows corresponding to last row-block. // Process the remaining rows corresponding to last row-block.
if (process_func != NULL) { if (process_func != NULL) {
process_func(dec, row > last_row ? last_row : row); process_func(dec, row > last_row ? last_row : row);