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Allow for a non-initialized alpha decompressor in DoRemap.

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BUG=oss-fuzz:9364

Change-Id: Ib1a1c6b0ccfcc255505f019e3e8fd15db73bc4b6
(cherry picked from commit da96d8d9ab)
This commit is contained in:
Vincent Rabaud 2018-07-13 22:09:06 +02:00 committed by James Zern
parent 916aac82c5
commit 0b271f10c4
2 changed files with 4 additions and 5 deletions
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3
src/dec/idec_dec.c
View File

@ -140,10 +140,9 @@ static void DoRemap(WebPIDecoder* const idec, ptrdiff_t offset) {
if (NeedCompressedAlpha(idec)) {
ALPHDecoder* const alph_dec = dec->alph_dec_;
dec->alpha_data_ += offset;
if (alph_dec != NULL) {
if (alph_dec != NULL && alph_dec->vp8l_dec_ != NULL) {
if (alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION) {
VP8LDecoder* const alph_vp8l_dec = alph_dec->vp8l_dec_;
assert(alph_vp8l_dec != NULL);
assert(dec->alpha_data_size_ >= ALPHA_HEADER_LEN);
VP8LBitReaderSetBuffer(&alph_vp8l_dec->br_,
dec->alpha_data_ + ALPHA_HEADER_LEN,

6
src/dec/vp8l_dec.c
View File

@ -1527,7 +1527,6 @@ int VP8LDecodeAlphaHeader(ALPHDecoder* const alph_dec,
if (dec == NULL) return 0;
assert(alph_dec != NULL);
alph_dec->vp8l_dec_ = dec;
dec->width_ = alph_dec->width_;
dec->height_ = alph_dec->height_;
@ -1559,11 +1558,12 @@ int VP8LDecodeAlphaHeader(ALPHDecoder* const alph_dec,
if (!ok) goto Err;
// Only set here, once we are sure it is valid (to avoid thread races).
alph_dec->vp8l_dec_ = dec;
return 1;
Err:
VP8LDelete(alph_dec->vp8l_dec_);
alph_dec->vp8l_dec_ = NULL;
VP8LDelete(dec);
return 0;
}