diff options
Diffstat (limited to 'src/liblzma/common/block_decoder.c')
| -rw-r--r-- | src/liblzma/common/block_decoder.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/liblzma/common/block_decoder.c b/src/liblzma/common/block_decoder.c index 4827e0f0..be647d48 100644 --- a/src/liblzma/common/block_decoder.c +++ b/src/liblzma/common/block_decoder.c @@ -123,7 +123,10 @@ block_decode(void *coder_ptr, const lzma_allocator *allocator, return LZMA_DATA_ERROR; } - if (!coder->ignore_check) + // Don't waste time updating the integrity check if it will be + // ignored. Also skip it if no new output was produced. This + // avoids null pointer + 0 (undefined behavior) when out == 0. + if (!coder->ignore_check && out_used > 0) lzma_check_update(&coder->check, coder->block->check, out + out_start, out_used); |