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crypto: rsa - Check MPI allocation errors

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Fixes: 6637e11e4a ("crypto: rsa - allow only odd e and restrict value in FIPS mode")
Fixes: f145d411a6 ("crypto: rsa - implement Chinese Remainder Theorem for faster private key operation")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2024-08-10 14:21:02 +08:00
parent 560efa7fca
commit 5a72a244ba
1 changed files with 12 additions and 7 deletions
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19
crypto/rsa.c
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@ -98,14 +98,13 @@ static int _rsa_dec_crt(const struct rsa_mpi_key *key, MPI m_or_m1_or_h, MPI c)
goto err_free_mpi;
/* (2iii) h = (m_1 - m_2) * qInv mod p */
mpi_sub(m12_or_qh, m_or_m1_or_h, m2);
mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);
ret = mpi_sub(m12_or_qh, m_or_m1_or_h, m2) ?:
mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);
/* (2iv) m = m_2 + q * h */
mpi_mul(m12_or_qh, key->q, m_or_m1_or_h);
mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);
ret = 0;
ret = ret ?:
mpi_mul(m12_or_qh, key->q, m_or_m1_or_h) ?:
mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);
err_free_mpi:
mpi_free(m12_or_qh);
@ -236,6 +235,7 @@ static int rsa_check_key_length(unsigned int len)
static int rsa_check_exponent_fips(MPI e)
{
MPI e_max = NULL;
int err;
/* check if odd */
if (!mpi_test_bit(e, 0)) {
@ -250,7 +250,12 @@ static int rsa_check_exponent_fips(MPI e)
e_max = mpi_alloc(0);
if (!e_max)
return -ENOMEM;
mpi_set_bit(e_max, 256);
err = mpi_set_bit(e_max, 256);
if (err) {
mpi_free(e_max);
return err;
}
if (mpi_cmp(e, e_max) >= 0) {
mpi_free(e_max);