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bn2bin(): Don't accept len < 0

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Test included

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20033)
This commit is contained in:
Richard Levitte 2023-01-13 12:51:43 +01:00 committed by Hugo Landau
parent 15192335c8
commit c9466f38e0
2 changed files with 43 additions and 0 deletions
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4
crypto/bn/bn_lib.c
View File

@ -440,6 +440,10 @@ static BIGNUM *bin2bn(const unsigned char *s, int len, BIGNUM *ret,
unsigned int n;
BIGNUM *bn = NULL;
/* Negative length is not acceptable */
if (len < 0)
return NULL;
if (ret == NULL)
ret = bn = BN_new();
if (ret == NULL)

39
test/bntest.c
View File

@ -2249,6 +2249,44 @@ static int test_bin2zero(void)
return ret;
}
static int test_bin2bn_lengths(void)
{
unsigned char input[] = { 1, 2 };
BIGNUM *bn_be = NULL, *bn_expected_be = NULL;
BIGNUM *bn_le = NULL, *bn_expected_le = NULL;
int ret = 0;
if (!TEST_ptr(bn_be = BN_new())
|| !TEST_ptr(bn_expected_be = BN_new())
|| !TEST_true(BN_set_word(bn_expected_be, 0x102))
|| !TEST_ptr(bn_le = BN_new())
|| !TEST_ptr(bn_expected_le = BN_new())
|| !TEST_true(BN_set_word(bn_expected_le, 0x201)))
goto err;
#define lengthtest(fn, e) \
if (!TEST_ptr_null(fn(input, -1, bn_##e)) \
|| !TEST_ptr(fn(input, 0, bn_##e)) \
|| !TEST_true(BN_is_zero(bn_##e)) \
|| !TEST_ptr(fn(input, 2, bn_##e)) \
|| !TEST_int_eq(BN_cmp(bn_##e, bn_expected_##e), 0)) \
goto err
lengthtest(BN_bin2bn, be);
lengthtest(BN_signed_bin2bn, be);
lengthtest(BN_lebin2bn, le);
lengthtest(BN_signed_lebin2bn, le);
#undef lengthtest
ret = 1;
err:
BN_free(bn_be);
BN_free(bn_expected_be);
BN_free(bn_le);
BN_free(bn_expected_le);
return ret;
}
static int test_rand(void)
{
BIGNUM *bn = NULL;
@ -3244,6 +3282,7 @@ int setup_tests(void)
ADD_TEST(test_hex2bn);
ADD_TEST(test_asc2bn);
ADD_TEST(test_bin2zero);
ADD_TEST(test_bin2bn_lengths);
ADD_ALL_TESTS(test_mpi, (int)OSSL_NELEM(kMPITests));
ADD_ALL_TESTS(test_bn2signed, (int)OSSL_NELEM(kSignedTests_BE));
ADD_TEST(test_negzero);