diff options
Diffstat (limited to 'src/liblzma/common/block_encoder.c')
| -rw-r--r-- | src/liblzma/common/block_encoder.c | 7 |
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; |