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Merge "Fix a crash in lossless decoder."

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This commit is contained in:
pascal massimino 2012-05-09 02:21:13 -07:00 committed by Gerrit Code Review
commit cb1bd741f9
1 changed files with 9 additions and 11 deletions
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20
src/dec/vp8l.c
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@ -301,7 +301,6 @@ static void DeleteHtreeGroups(HTreeGroup* htree_groups, int num_htree_groups) {
static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
int color_cache_bits) {
int ok = 0;
int i, j;
VP8LBitReader* const br = &dec->br_;
VP8LMetadata* const hdr = &dec->hdr_;
@ -331,31 +330,30 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
}
}
if (br->error_) goto Error;
htree_groups = (HTreeGroup*)calloc(num_htree_groups, sizeof(*htree_groups));
if (htree_groups == NULL) {
dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
goto Error;
}
ok = !br->error_;
for (i = 0; ok && i < num_htree_groups; ++i) {
for (i = 0; i < num_htree_groups; ++i) {
HuffmanTree* const htrees = htree_groups[i].htrees_;
for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
int alphabet_size = kAlphabetSize[j];
if (j == 0 && color_cache_bits > 0) {
alphabet_size += 1 << color_cache_bits;
}
ok = ReadHuffmanCode(alphabet_size, dec, htrees + j);
ok = ok && !br->error_;
if (!ReadHuffmanCode(alphabet_size, dec, htrees + j)) goto Error;
}
}
if (ok) { // finalize pointers and return
hdr->huffman_image_ = huffman_image;
hdr->num_htree_groups_ = num_htree_groups;
hdr->htree_groups_ = htree_groups;
return ok;
}
// All OK. Finalize pointers and return.
hdr->huffman_image_ = huffman_image;
hdr->num_htree_groups_ = num_htree_groups;
hdr->htree_groups_ = htree_groups;
return 1;
Error:
free(huffman_image);