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libbacktrace: skip all LZMA block header padding bytes (28824f2)
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@ -5586,6 +5586,7 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
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uint64_t header_compressed_size;
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uint64_t header_uncompressed_size;
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unsigned char lzma2_properties;
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size_t crc_offset;
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uint32_t computed_crc;
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uint32_t stream_crc;
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size_t uncompressed_offset;
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@ -5689,19 +5690,20 @@ elf_uncompress_lzma_block (const unsigned char *compressed,
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/* The properties describe the dictionary size, but we don't care
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what that is. */
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/* Block header padding. */
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if (unlikely (off + 4 > compressed_size))
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/* Skip to just before CRC, verifying zero bytes in between. */
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crc_offset = block_header_offset + block_header_size - 4;
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if (unlikely (crc_offset + 4 > compressed_size))
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{
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elf_uncompress_failed ();
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return 0;
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}
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off = (off + 3) &~ (size_t) 3;
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if (unlikely (off + 4 > compressed_size))
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for (; off < crc_offset; off++)
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{
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elf_uncompress_failed ();
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return 0;
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if (compressed[off] != 0)
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{
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elf_uncompress_failed ();
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return 0;
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}
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}
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/* Block header CRC. */
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