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-rw-r--r--src/liblzma/common/block_header_decoder.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/liblzma/common/block_header_decoder.c b/src/liblzma/common/block_header_decoder.c
index 9b9408b0..c4935dcf 100644
--- a/src/liblzma/common/block_header_decoder.c
+++ b/src/liblzma/common/block_header_decoder.c
@@ -23,6 +23,10 @@ lzma_block_header_decode(lzma_block *block,
// are invalid or over 63 bits, or if the header is too small
// to contain the claimed information.
+ // Catch unexpected NULL pointers.
+ if (block == NULL || block->filters == NULL || in == NULL)
+ return LZMA_PROG_ERROR;
+
// Initialize the filter options array. This way the caller can
// safely free() the options even if an error occurs in this function.
for (size_t i = 0; i <= LZMA_FILTERS_MAX; ++i) {