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-rw-r--r--src/liblzma/common/block_encoder.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/liblzma/common/block_encoder.c b/src/liblzma/common/block_encoder.c
index 520ecc5a..4a136ef6 100644
--- a/src/liblzma/common/block_encoder.c
+++ b/src/liblzma/common/block_encoder.c
@@ -77,8 +77,11 @@ block_encode(void *coder_ptr, const lzma_allocator *allocator,
// checked it at the beginning of this function.
coder->uncompressed_size += in_used;
- lzma_check_update(&coder->check, coder->block->check,
- in + in_start, in_used);
+ // Call lzma_check_update() only if input was consumed. This
+ // avoids null pointer + 0 (undefined behavior) when in == 0.
+ if (in_used > 0)
+ lzma_check_update(&coder->check, coder->block->check,
+ in + in_start, in_used);
if (ret != LZMA_STREAM_END || action == LZMA_SYNC_FLUSH)
return ret;