From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6C0E2AE94; Thu, 23 May 2024 13:18:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716470314; cv=none; b=Kg/Z85Ko7ghbFXw+b9Xq8j00wUfd3iOxIUoOLfi/e2/rDL6V+olq4lKHOphXb3gXOIoVoNUZjseQ16iP+OiqMCxElA29wV41wgC+Dq2JziA8IxKo7KSrdk2Pcq7oXbQBPpvoikNSUXGcvwrmt4LAJJaX9h6wLHqao9rhCUWc5aM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716470314; c=relaxed/simple; bh=AaohpwymvVuZ9a1TjvxqUNfh+zISq2Wt2cNx8AJsYso=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F2V/WU/xJji9XKl99T8ukn//jH2vPwMG8fbx13WxpEM0btR7yzcWxwOgn+Jr7DCBZRv980+kJRI0ReIPxsL0J/6dEed0OHtGZhFPp/3pFAlirwhr1hrbib6ADcxMLrd1c4od8VIGe/bx6xOkhND3blkO95jkZ9IMNw2b5zjx2yc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=de+isobh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="de+isobh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DCDBC3277B; Thu, 23 May 2024 13:18:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1716470314; bh=AaohpwymvVuZ9a1TjvxqUNfh+zISq2Wt2cNx8AJsYso=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=de+isobhtDuYT3cT3MbfuZaNQoZe0/eHaBvD11lNmtiQXPDM1Utt6v+qAwi+08VYm W3W7S69+LeRRgKbPZj16xpXQjPRKpYq2AhBhnJDzXAjbRrvM+9xXmTaR20OR0bOKq2 BTWjOxNl9JokLsfhOtgx4tqsJE86IXnFGF/2hzYk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jarkko Sakkinen Subject: [PATCH 5.15 04/23] KEYS: trusted: Fix memory leak in tpm2_key_encode() Date: Thu, 23 May 2024 15:13:00 +0200 Message-ID: <20240523130328.122768633@linuxfoundation.org> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240523130327.956341021@linuxfoundation.org> References: <20240523130327.956341021@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jarkko Sakkinen commit ffcaa2172cc1a85ddb8b783de96d38ca8855e248 upstream. 'scratch' is never freed. Fix this by calling kfree() in the success, and in the error case. Cc: stable@vger.kernel.org # +v5.13 Fixes: f2219745250f ("security: keys: trusted: use ASN.1 TPM2 key format for the blobs") Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- security/keys/trusted-keys/trusted_tpm2.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) --- a/security/keys/trusted-keys/trusted_tpm2.c +++ b/security/keys/trusted-keys/trusted_tpm2.c @@ -38,6 +38,7 @@ static int tpm2_key_encode(struct truste u8 *end_work = scratch + SCRATCH_SIZE; u8 *priv, *pub; u16 priv_len, pub_len; + int ret; priv_len = get_unaligned_be16(src) + 2; priv = src; @@ -57,8 +58,10 @@ static int tpm2_key_encode(struct truste unsigned char bool[3], *w = bool; /* tag 0 is emptyAuth */ w = asn1_encode_boolean(w, w + sizeof(bool), true); - if (WARN(IS_ERR(w), "BUG: Boolean failed to encode")) - return PTR_ERR(w); + if (WARN(IS_ERR(w), "BUG: Boolean failed to encode")) { + ret = PTR_ERR(w); + goto err; + } work = asn1_encode_tag(work, end_work, 0, bool, w - bool); } @@ -69,8 +72,10 @@ static int tpm2_key_encode(struct truste * trigger, so if it does there's something nefarious going on */ if (WARN(work - scratch + pub_len + priv_len + 14 > SCRATCH_SIZE, - "BUG: scratch buffer is too small")) - return -EINVAL; + "BUG: scratch buffer is too small")) { + ret = -EINVAL; + goto err; + } work = asn1_encode_integer(work, end_work, options->keyhandle); work = asn1_encode_octet_string(work, end_work, pub, pub_len); @@ -79,10 +84,17 @@ static int tpm2_key_encode(struct truste work1 = payload->blob; work1 = asn1_encode_sequence(work1, work1 + sizeof(payload->blob), scratch, work - scratch); - if (WARN(IS_ERR(work1), "BUG: ASN.1 encoder failed")) - return PTR_ERR(work1); + if (WARN(IS_ERR(work1), "BUG: ASN.1 encoder failed")) { + ret = PTR_ERR(work1); + goto err; + } + kfree(scratch); return work1 - payload->blob; + +err: + kfree(scratch); + return ret; } struct tpm2_key_context {