Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 117/340] crypto: ecdh_helper - Ensure len >= secret.len in decode_key() | Date | Mon, 1 Mar 2021 17:11:01 +0100 |
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From: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
[ Upstream commit a53ab94eb6850c3657392e2d2ce9b38c387a2633 ]
The length ('len' parameter) passed to crypto_ecdh_decode_key() is never checked against the length encoded in the passed buffer ('buf' parameter). This could lead to an out-of-bounds access when the passed length is less than the encoded length.
Add a check to prevent that.
Fixes: 3c4b23901a0c7 ("crypto: ecdh - Add ECDH software support") Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org> --- crypto/ecdh_helper.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/crypto/ecdh_helper.c b/crypto/ecdh_helper.c index 66fcb2ea81544..fca63b559f655 100644 --- a/crypto/ecdh_helper.c +++ b/crypto/ecdh_helper.c @@ -67,6 +67,9 @@ int crypto_ecdh_decode_key(const char *buf, unsigned int len, if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH) return -EINVAL; + if (unlikely(len < secret.len)) + return -EINVAL; + ptr = ecdh_unpack_data(¶ms->curve_id, ptr, sizeof(params->curve_id)); ptr = ecdh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size)); if (secret.len != crypto_ecdh_key_len(params)) -- 2.27.0
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