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alpha_dec: add missing VP8SetError()

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in AllocateAlphaPlane() and VP8DecompressAlphaRows().

Found by Nallocfuzz (https://github.com/catenacyber/nallocfuzz).

Change-Id: I39eb305abfe9f4d7915cce5d91e72917f482bc20
This commit is contained in:
James Zern 2023-07-18 21:18:12 +00:00
parent 0081693d61
commit ee72299796
1 changed files with 12 additions and 2 deletions
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14
src/dec/alpha_dec.c
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@ -146,7 +146,8 @@ static int AllocateAlphaPlane(VP8Decoder* const dec, const VP8Io* const io) {
dec->alpha_plane_mem_ =
(uint8_t*)WebPSafeMalloc(alpha_size, sizeof(*dec->alpha_plane_));
if (dec->alpha_plane_mem_ == NULL) {
return 0;
return VP8SetError(dec, VP8_STATUS_OUT_OF_MEMORY,
"Alpha decoder initialization failed.");
}
dec->alpha_plane_ = dec->alpha_plane_mem_;
dec->alpha_prev_line_ = NULL;
@ -180,10 +181,19 @@ const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
if (!dec->is_alpha_decoded_) {
if (dec->alph_dec_ == NULL) { // Initialize decoder.
dec->alph_dec_ = ALPHNew();
if (dec->alph_dec_ == NULL) return NULL;
if (dec->alph_dec_ == NULL) {
VP8SetError(dec, VP8_STATUS_OUT_OF_MEMORY,
"Alpha decoder initialization failed.");
return NULL;
}
if (!AllocateAlphaPlane(dec, io)) goto Error;
if (!ALPHInit(dec->alph_dec_, dec->alpha_data_, dec->alpha_data_size_,
io, dec->alpha_plane_)) {
VP8LDecoder* const vp8l_dec = dec->alph_dec_->vp8l_dec_;
VP8SetError(dec,
(vp8l_dec == NULL) ? VP8_STATUS_OUT_OF_MEMORY
: vp8l_dec->status_,
"Alpha decoder initialization failed.");
goto Error;
}
// if we allowed use of alpha dithering, check whether it's needed at all