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-rw-r--r--src/xz/list.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/xz/list.c b/src/xz/list.c
index a9e0adb9..13abd8f7 100644
--- a/src/xz/list.c
+++ b/src/xz/list.c
@@ -456,7 +456,19 @@ parse_block_header(file_pair *pair, const lzma_index_iter *iter,
switch (lzma_block_compressed_size(&block,
iter->block.unpadded_size)) {
case LZMA_OK:
- break;
+ // Validate also block.uncompressed_size if it is present.
+ // If it isn't present, there's no need to set it since
+ // we aren't going to actually decompress the Block; if
+ // we were decompressing, then we should set it so that
+ // the Block decoder could validate the Uncompressed Size
+ // that was stored in the Index.
+ if (block.uncompressed_size == LZMA_VLI_UNKNOWN
+ || block.uncompressed_size
+ == iter->block.uncompressed_size)
+ break;
+
+ // If the above fails, the file is corrupt so
+ // LZMA_DATA_ERROR is a good error code.
case LZMA_DATA_ERROR:
// Free the memory allocated by lzma_block_header_decode().