diff options
Diffstat (limited to '')
| -rw-r--r-- | src/liblzma/delta/delta_decoder.c | 7 | ||||
| -rw-r--r-- | src/liblzma/delta/delta_encoder.c | 12 |
2 files changed, 16 insertions, 3 deletions
diff --git a/src/liblzma/delta/delta_decoder.c b/src/liblzma/delta/delta_decoder.c index 13d8a28f..77cf65cc 100644 --- a/src/liblzma/delta/delta_decoder.c +++ b/src/liblzma/delta/delta_decoder.c @@ -42,7 +42,12 @@ delta_decode(void *coder_ptr, const lzma_allocator *allocator, in, in_pos, in_size, out, out_pos, out_size, action); - decode_buffer(coder, out + out_start, *out_pos - out_start); + // out might be NULL. In that case size == 0. Null pointer + 0 is + // undefined behavior so skip the call in that case as it would + // do nothing anyway. + const size_t size = *out_pos - out_start; + if (size > 0) + decode_buffer(coder, out + out_start, size); return ret; } diff --git a/src/liblzma/delta/delta_encoder.c b/src/liblzma/delta/delta_encoder.c index 38416515..056bf746 100644 --- a/src/liblzma/delta/delta_encoder.c +++ b/src/liblzma/delta/delta_encoder.c @@ -63,7 +63,12 @@ delta_encode(void *coder_ptr, const lzma_allocator *allocator, const size_t out_avail = out_size - *out_pos; const size_t size = my_min(in_avail, out_avail); - copy_and_encode(coder, in + *in_pos, out + *out_pos, size); + // in and out might be NULL. In such cases size == 0. + // Null pointer + 0 is undefined behavior so skip + // the call in that case as it would do nothing anyway. + if (size > 0) + copy_and_encode(coder, in + *in_pos, out + *out_pos, + size); *in_pos += size; *out_pos += size; @@ -78,7 +83,10 @@ delta_encode(void *coder_ptr, const lzma_allocator *allocator, in, in_pos, in_size, out, out_pos, out_size, action); - encode_in_place(coder, out + out_start, *out_pos - out_start); + // Like above, avoid null pointer + 0. + const size_t size = *out_pos - out_start; + if (size > 0) + encode_in_place(coder, out + out_start, size); } return ret; |