@@ -5568,6 +5568,7 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
uint64_t header_compressed_size;
uint64_t header_uncompressed_size;
unsigned char lzma2_properties;
+ size_t crc_offset;
uint32_t computed_crc;
uint32_t stream_crc;
size_t uncompressed_offset;
@@ -5671,19 +5672,20 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
/* The properties describe the dictionary size, but we don't care
what that is. */
- /* Block header padding. */
- if (unlikely (off + 4 > compressed_size))
+ /* Skip to just before CRC, verifying zero bytes in between. */
+ crc_offset = block_header_offset + block_header_size - 4;
+ if (unlikely (crc_offset + 4 > compressed_size))
{
elf_uncompress_failed ();
return 0;
}
-
- off = (off + 3) &~ (size_t) 3;
-
- if (unlikely (off + 4 > compressed_size))
+ for (; off < crc_offset; off++)
{
- elf_uncompress_failed ();
- return 0;
+ if (compressed[off] != 0)
+ {
+ elf_uncompress_failed ();
+ return 0;
+ }
}
/* Block header CRC. */