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ima: fix reference leak in asymmetric_verify() 

Don't leak a reference to the key if its algorithm is unknown.

Fixes: 947d705972 ("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>
This commit is contained in:
Eric Biggers 2022-01-13 11:44:38 -08:00 committed by Mimi Zohar
parent e783362eb5
commit 926fd9f23b
1 changed files with 9 additions and 6 deletions
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15
security/integrity/digsig_asymmetric.c
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@ -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;