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misc fixes in libwebpmux

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* Assert chunklist
  * fix potential memory leak and
  * fix null pointer access

There should not be several alpha_ or img_ chunks in SynthesizeBitstream. Use ChunkListDelete in MuxImageRelease to be safe.
A null pointer accessed in WebPMuxPushFrame triggered a harmless runtime error.

Change-Id: I3027f8752093652bd41f55e667d041c0de77ab6e
This commit is contained in:
Yannis Guyon
2018-07-04 20:19:47 +02:00
parent e00af13ef4
commit 4338cd36fe
3 changed files with 12 additions and 6 deletions
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6
src/mux/muxedit.c
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@ -266,14 +266,14 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* info,
int copy_data) {
WebPMuxImage wpi;
WebPMuxError err;
const WebPData* const bitstream = &info->bitstream;
// Sanity checks.
if (mux == NULL || info == NULL) return WEBP_MUX_INVALID_ARGUMENT;
if (info->id != WEBP_CHUNK_ANMF) return WEBP_MUX_INVALID_ARGUMENT;
if (bitstream->bytes == NULL || bitstream->size > MAX_CHUNK_PAYLOAD) {
if (info->bitstream.bytes == NULL ||
info->bitstream.size > MAX_CHUNK_PAYLOAD) {
return WEBP_MUX_INVALID_ARGUMENT;
}
@ -287,7 +287,7 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* info,
}
MuxImageInit(&wpi);
err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi);
err = SetAlphaAndImageChunks(&info->bitstream, copy_data, &wpi);
if (err != WEBP_MUX_OK) goto Err;
assert(wpi.img_ != NULL); // As SetAlphaAndImageChunks() was successful.