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evm: Fix possible memory leak in evm_calc_hmac_or_hash()

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commit 0c4395fb2a upstream.

Don't immediately return if the signature is portable and security.ima is
not present. Just set error so that memory allocated is freed before
returning from evm_calc_hmac_or_hash().

Fixes: 50b977481f ("EVM: Add support for portable signature format")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roberto Sassu 2020-04-14 10:01:31 +02:00 committed by Greg Kroah-Hartman
parent d52a190318
commit 3815f6508d
1 changed files with 1 additions and 1 deletions
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2
security/integrity/evm/evm_crypto.c
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@ -249,7 +249,7 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry,
/* Portable EVM signatures must include an IMA hash */
if (type == EVM_XATTR_PORTABLE_DIGSIG && !ima_present)
return -EPERM;
error = -EPERM;
out:
kfree(xattr_value);
kfree(desc);