libFLAC: Add metadata size checks to FLAC library
This follows on from the previous patch.
Patch-from: lvqcl <lvqcl.mail@gmail.com>
diff --git a/src/libFLAC/metadata_iterators.c b/src/libFLAC/metadata_iterators.c
index 9356416..1acb19c 100644
--- a/src/libFLAC/metadata_iterators.c
+++ b/src/libFLAC/metadata_iterators.c
@@ -2536,6 +2536,9 @@
FLAC__byte buffer[FLAC__STREAM_METADATA_HEADER_LENGTH];
FLAC__ASSERT(block->length < (1u << FLAC__STREAM_METADATA_LENGTH_LEN));
+ /* double protection */
+ if(block->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN))
+ return false;
buffer[0] = (block->is_last? 0x80 : 0) | (FLAC__byte)block->type;
pack_uint32_(block->length, buffer + 1, 3);