diff options
Diffstat (limited to 'src/liblzma/common/index_decoder.c')
| -rw-r--r-- | src/liblzma/common/index_decoder.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/liblzma/common/index_decoder.c b/src/liblzma/common/index_decoder.c index 8622b2f0..19a31b3e 100644 --- a/src/liblzma/common/index_decoder.c +++ b/src/liblzma/common/index_decoder.c @@ -203,9 +203,16 @@ index_decode(void *coder_ptr, const lzma_allocator *allocator, } out: - // Update the CRC32, - coder->crc32 = lzma_crc32(in + in_start, - *in_pos - in_start, coder->crc32); + // Update the CRC32. + // + // Avoid null pointer + 0 (undefined behavior) in "in + in_start". + // In such a case we had no input and thus in_used == 0. + { + const size_t in_used = *in_pos - in_start; + if (in_used > 0) + coder->crc32 = lzma_crc32(in + in_start, + in_used, coder->crc32); + } return ret; } |