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-rw-r--r--src/liblzma/common/index.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/liblzma/common/index.c b/src/liblzma/common/index.c
index e0b14a3d..24ec3c10 100644
--- a/src/liblzma/common/index.c
+++ b/src/liblzma/common/index.c
@@ -771,6 +771,9 @@ extern LZMA_API(lzma_ret)
lzma_index_cat(lzma_index *restrict dest, lzma_index *restrict src,
const lzma_allocator *allocator)
{
+ if (dest == NULL || src == NULL)
+ return LZMA_PROG_ERROR;
+
const lzma_vli dest_file_size = lzma_index_file_size(dest);
// Check that we don't exceed the file size limits.