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Detect canvas and image size mismatch in decoder.

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Will probably have to be re-visited when FRGM are
switched on.

Change-Id: I51c15e4c3887ab8f04d92ec783deca274cd09f41
This commit is contained in:
Pascal Massimino 2013-07-02 22:43:42 +00:00 committed by James Zern
parent 30c8158a53
commit f626fe2e9f
1 changed files with 25 additions and 8 deletions
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33
src/dec/webp.c
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@ -286,6 +286,10 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
int* const has_alpha, int* const has_alpha,
int* const has_animation, int* const has_animation,
WebPHeaderStructure* const headers) { WebPHeaderStructure* const headers) {
int canvas_width = 0;
int canvas_height = 0;
int image_width = 0;
int image_height = 0;
int found_riff = 0; int found_riff = 0;
int found_vp8x = 0; int found_vp8x = 0;
VP8StatusCode status; VP8StatusCode status;
@ -308,19 +312,25 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
// Skip over VP8X. // Skip over VP8X.
{ {
uint32_t flags = 0; uint32_t flags = 0;
status = ParseVP8X(&data, &data_size, &found_vp8x, width, height, &flags); int animation_present;
status = ParseVP8X(&data, &data_size, &found_vp8x,
&canvas_width, &canvas_height, &flags);
if (status != VP8_STATUS_OK) { if (status != VP8_STATUS_OK) {
return status; // Wrong VP8X / insufficient data. return status; // Wrong VP8X / insufficient data.
} }
animation_present = !!(flags & ANIMATION_FLAG);
if (!found_riff && found_vp8x) { if (!found_riff && found_vp8x) {
// Note: This restriction may be removed in the future, if it becomes // Note: This restriction may be removed in the future, if it becomes
// necessary to send VP8X chunk to the decoder. // necessary to send VP8X chunk to the decoder.
return VP8_STATUS_BITSTREAM_ERROR; return VP8_STATUS_BITSTREAM_ERROR;
} }
if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG); if (has_alpha != NULL) *has_alpha = !!(flags & ALPHA_FLAG);
if (has_animation != NULL) *has_animation = !!(flags & ANIMATION_FLAG); if (has_animation != NULL) *has_animation = animation_present;
if (found_vp8x && headers == NULL) {
return VP8_STATUS_OK; // Return features from VP8X header. if (found_vp8x && animation_present && headers == NULL) {
if (width != NULL) *width = canvas_width;
if (height != NULL) *height = canvas_height;
return VP8_STATUS_OK; // Just return features from VP8X header.
} }
} }
@ -351,8 +361,8 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return VP8_STATUS_NOT_ENOUGH_DATA; return VP8_STATUS_NOT_ENOUGH_DATA;
} }
// Validates raw VP8 data. // Validates raw VP8 data.
if (!VP8GetInfo(data, data_size, if (!VP8GetInfo(data, data_size, (uint32_t)hdrs.compressed_size,
(uint32_t)hdrs.compressed_size, width, height)) { &image_width, &image_height)) {
return VP8_STATUS_BITSTREAM_ERROR; return VP8_STATUS_BITSTREAM_ERROR;
} }
} else { } else {
@ -360,11 +370,18 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return VP8_STATUS_NOT_ENOUGH_DATA; return VP8_STATUS_NOT_ENOUGH_DATA;
} }
// Validates raw VP8L data. // Validates raw VP8L data.
if (!VP8LGetInfo(data, data_size, width, height, has_alpha)) { if (!VP8LGetInfo(data, data_size, &image_width, &image_height, has_alpha)) {
return VP8_STATUS_BITSTREAM_ERROR; return VP8_STATUS_BITSTREAM_ERROR;
} }
} }
// Validates image size coherency. TODO(urvang): what about FRGM?
if (found_vp8x) {
if (canvas_width != image_width || canvas_height != image_height) {
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (width != NULL) *width = image_width;
if (height != NULL) *height = image_height;
if (has_alpha != NULL) { if (has_alpha != NULL) {
// If the data did not contain a VP8X/VP8L chunk the only definitive way // If the data did not contain a VP8X/VP8L chunk the only definitive way
// to set this is by looking for alpha data (from an ALPH chunk). // to set this is by looking for alpha data (from an ALPH chunk).