Tiny bit better sanity check in block_util.c

diff --git a/src/liblzma/common/block_util.c b/src/liblzma/common/block_util.c
index 1dccacf..fa25b9a 100644 (file)
--- a/src/liblzma/common/block_util.c
+++ b/src/liblzma/common/block_util.c
@@ -58,7 +58,7 @@ lzma_block_unpadded_size(const lzma_block *block)
        // NOTE: This function is used for validation too, so it is
        // essential that these checks are always done even if
        // Compressed Size is unknown.
-       if (block->version != 0
+       if (block == NULL || block->version != 0
                        || block->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
                        || block->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
                        || (block->header_size & 3)