diff options
Diffstat (limited to 'src/liblzma/common/index_encoder.c')
| -rw-r--r-- | src/liblzma/common/index_encoder.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/liblzma/common/index_encoder.c b/src/liblzma/common/index_encoder.c index c7cafb72..204490cc 100644 --- a/src/liblzma/common/index_encoder.c +++ b/src/liblzma/common/index_encoder.c @@ -153,8 +153,15 @@ index_encode(void *coder_ptr, out: // Update the CRC32. - coder->crc32 = lzma_crc32(out + out_start, - *out_pos - out_start, coder->crc32); + // + // Avoid null pointer + 0 (undefined behavior) in "out + out_start". + // In such a case we had no input and thus out_used == 0. + { + const size_t out_used = *out_pos - out_start; + if (out_used > 0) + coder->crc32 = lzma_crc32(out + out_start, + out_used, coder->crc32); + } return ret; } |