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author | Eric Biggers <ebiggers@google.com> | 2022-01-13 11:44:38 -0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-16 12:56:03 +0100 |
commit | 0838d6d68182f0b28a5434bc6d50727c4757e35b (patch) | |
tree | de5adb2befdb6655a03f381649fdc67f175033d9 /security | |
parent | 739b7bb886b5ffa40a9492398aa04b01438e598b (diff) | |
download | linux-stable-0838d6d68182f0b28a5434bc6d50727c4757e35b.tar.gz linux-stable-0838d6d68182f0b28a5434bc6d50727c4757e35b.tar.bz2 linux-stable-0838d6d68182f0b28a5434bc6d50727c4757e35b.zip |
ima: fix reference leak in asymmetric_verify()
commit 926fd9f23b27ca6587492c3f58f4c7f4cd01dad5 upstream.
Don't leak a reference to the key if its algorithm is unknown.
Fixes: 947d70597236 ("ima: Support EC keys for signature verification")
Cc: <stable@vger.kernel.org> # v5.13+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
-rw-r--r-- | security/integrity/digsig_asymmetric.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c index 23240d793b07..895f4b9ce8c6 100644 --- a/security/integrity/digsig_asymmetric.c +++ b/security/integrity/digsig_asymmetric.c @@ -109,22 +109,25 @@ int asymmetric_verify(struct key *keyring, const char *sig, pk = asymmetric_key_public_key(key); pks.pkey_algo = pk->pkey_algo; - if (!strcmp(pk->pkey_algo, "rsa")) + if (!strcmp(pk->pkey_algo, "rsa")) { pks.encoding = "pkcs1"; - else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) + } else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) { /* edcsa-nist-p192 etc. */ pks.encoding = "x962"; - else if (!strcmp(pk->pkey_algo, "ecrdsa") || - !strcmp(pk->pkey_algo, "sm2")) + } else if (!strcmp(pk->pkey_algo, "ecrdsa") || + !strcmp(pk->pkey_algo, "sm2")) { pks.encoding = "raw"; - else - return -ENOPKG; + } else { + ret = -ENOPKG; + goto out; + } pks.digest = (u8 *)data; pks.digest_size = datalen; pks.s = hdr->sig; pks.s_size = siglen; ret = verify_signature(key, &pks); +out: key_put(key); pr_debug("%s() = %d\n", __func__, ret); return ret; |