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-rw-r--r--src/liblzma/common/block_util.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/liblzma/common/block_util.c b/src/liblzma/common/block_util.c
index 1dccacf4..fa25b9a0 100644
--- 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)