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| author | fullwaywang <fullwaywang@tencent.com> | 2023-06-21 15:00:06 +0800 |
|---|---|---|
| committer | Pauli <pauli@openssl.org> | 2023-06-26 08:07:55 +1000 |
| commit | 43596b306b1fe06da3b1a99e07c0cf235898010d (patch) | |
| tree | c9e7d43f693a778cd1e5483a284a3c8bd4a84782 | |
| parent | a7c54dde5189f11c046f638e5aaf2004aee34202 (diff) | |
| download | openssl-43596b306b1fe06da3b1a99e07c0cf235898010d.tar.gz | |
Check for 0 modulus in BN_RECP_CTX_set.
The function BN_RECP_CTX_set did not check whether arg d is zero,
in which case an early failure should be returned to the invoker.
This is a similar fix to the cognate defect of CVE-2015-1794.
Fixes #21111
CLA: trivial
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21255)
| -rw-r--r-- | crypto/bn/bn_recp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/bn/bn_recp.c b/crypto/bn/bn_recp.c index 462329ad25..aa548d62ea 100644 --- a/crypto/bn/bn_recp.c +++ b/crypto/bn/bn_recp.c @@ -42,7 +42,7 @@ void BN_RECP_CTX_free(BN_RECP_CTX *recp) int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *d, BN_CTX *ctx) { - if (!BN_copy(&(recp->N), d)) + if (BN_is_zero(d) || !BN_copy(&(recp->N), d)) return 0; BN_zero(&(recp->Nr)); recp->num_bits = BN_num_bits(d); |