libwebp/rhbz-1956853.patch

43 lines
1.3 KiB
Diff
Raw Normal View History

diff --git a/src/mux/muxread.c b/src/mux/muxread.c
index 0b55286..eb5070b 100644
--- a/src/mux/muxread.c
+++ b/src/mux/muxread.c
@@ -187,7 +187,7 @@
size = bitstream->size;
if (data == NULL) return NULL;
- if (size < RIFF_HEADER_SIZE) return NULL;
+ if (size < RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE) return NULL;
if (GetLE32(data + 0) != MKFOURCC('R', 'I', 'F', 'F') ||
GetLE32(data + CHUNK_HEADER_SIZE) != MKFOURCC('W', 'E', 'B', 'P')) {
return NULL;
@@ -196,8 +196,6 @@
mux = WebPMuxNew();
if (mux == NULL) return NULL;
- if (size < RIFF_HEADER_SIZE + TAG_SIZE) goto Err;
-
tag = GetLE32(data + RIFF_HEADER_SIZE);
if (tag != kChunks[IDX_VP8].tag &&
tag != kChunks[IDX_VP8L].tag &&
@@ -206,12 +204,11 @@
}
riff_size = SizeWithPadding(GetLE32(data + TAG_SIZE));
- if (riff_size > MAX_CHUNK_PAYLOAD || riff_size > size) {
- goto Err;
- } else {
- if (riff_size < size) { // Redundant data after last chunk.
- size = riff_size; // To make sure we don't read any data beyond mux_size.
- }
+ if (riff_size < CHUNK_HEADER_SIZE) goto Err;
+ if (riff_size > MAX_CHUNK_PAYLOAD || riff_size > size) goto Err;
+ // There's no point in reading past the end of the RIFF chunk.
+ if (size > riff_size + CHUNK_HEADER_SIZE) {
+ size = riff_size + CHUNK_HEADER_SIZE;
}
end = data + size;