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Tests: test_index: Test the stricter Number of Records condition

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This commit is contained in:
Lasse Collin 2026-07-20 20:00:06 +03:00
parent a9c92328bd
commit 47c44e9008
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1 changed files with 45 additions and 0 deletions
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tests/test_index.c
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@ -1852,6 +1852,50 @@ test_decode_empty_and_append(void)
}
static void
test_huge_number_of_records(void)
{
#ifndef HAVE_DECODERS
assert_skip("Decoder support disabled");
#else
size_t in_size;
uint8_t *in = tuktest_file_from_srcdir(
"files/bad-0-index-1.xz", &in_size);
assert_uint_eq(in_size, 32);
lzma_index *i = NULL;
// When using the the public API of the multi-call decoder,
// we cannot inform it how big the Index may be at most.
// Thus, a huge value in Number of Records looks valid to it
// and we get LZMA_MEMLIMIT_ERROR.
lzma_stream strm = LZMA_STREAM_INIT;
assert_lzma_ret(lzma_index_decoder(&strm, &i, MEMLIMIT), LZMA_OK);
strm.next_in = in + LZMA_STREAM_HEADER_SIZE;
strm.avail_in = in_size - LZMA_STREAM_HEADER_SIZE;
assert_lzma_ret(lzma_code(&strm, LZMA_RUN), LZMA_MEMLIMIT_ERROR);
assert_uint(lzma_memusage(&strm), >, UINT64_C(100) << 30);
lzma_end(&strm);
// In contrast, lzma_index_buffer_decode() and
// lzma_file_info_decoder() know the input size. With these decoders,
// liblzma <= 5.8.3 returns LZMA_MEMLIMIT_ERROR because it doesn't
// sanity check the value in Number of Records against the input size.
uint64_t memlimit = MEMLIMIT;
size_t in_pos = LZMA_STREAM_HEADER_SIZE;
assert_lzma_ret(lzma_index_buffer_decode(&i, &memlimit, NULL,
in, &in_pos, in_size), LZMA_DATA_ERROR);
assert_lzma_ret(lzma_file_info_decoder(&strm, &i, MEMLIMIT, in_size),
LZMA_OK);
strm.next_in = in;
strm.avail_in = in_size;
assert_lzma_ret(lzma_code(&strm, LZMA_RUN), LZMA_DATA_ERROR);
lzma_end(&strm);
#endif
}
extern int
main(int argc, char **argv)
{
@ -1882,6 +1926,7 @@ main(int argc, char **argv)
tuktest_run(test_lzma_index_buffer_encode);
tuktest_run(test_lzma_index_buffer_decode);
tuktest_run(test_decode_empty_and_append);
tuktest_run(test_huge_number_of_records);
lzma_index_end(decode_test_index, NULL);
return tuktest_end();
}