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| author | Daniele Alessandrelli <daniele.alessandrelli@intel.com> | 2021-02-03 14:28:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-03 19:44:36 +0300 |
| commit | db5d0634e2fc519c00b8c2cb3329c5b3c5500417 (patch) | |
| tree | c25bdb5b140f2df80f7f5baf44349031db858f80 /crypto | |
| parent | 2f36ef5863955893af5a99e0b2d73c8e2b6401a4 (diff) | |
| download | linux-db5d0634e2fc519c00b8c2cb3329c5b3c5500417.tar.xz | |
crypto: ecdh_helper - Ensure 'len >= secret.len' in decode_key()
[ 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>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/ecdh_helper.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/crypto/ecdh_helper.c b/crypto/ecdh_helper.c index 3cd8a2414e60..de43ffb53840 100644 --- a/crypto/ecdh_helper.c +++ b/crypto/ecdh_helper.c @@ -71,6 +71,9 @@ 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)) |