iemejia commented on code in PR #3853:
URL: https://github.com/apache/avro/pull/3853#discussion_r3567574843
##########
lang/c/src/codec.c:
##########
@@ -483,11 +609,41 @@ static int decode_lzma(avro_codec_t codec, void * data,
int64_t len)
codec->used_size = write_pos;
- // If it ran out of space to decode, give it more!!
- // It will continue where it left off because of read_pos and
write_pos.
+ // Reject a block that decompresses to more than the allowed
maximum,
+ // to guard against unbounded allocation from a high-ratio
block.
Review Comment:
Fixed — decode_lzma now rejects a compressed `len` that is negative or >
SIZE_MAX before passing it to lzma_raw_buffer_decode's size_t input-size
parameter.
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