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 B383146B5 for ; Mon, 16 Jan 2023 16:18:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36FF4C433D2; Mon, 16 Jan 2023 16:18:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673885937; bh=pzvvp4SUZ9H05ocdDsuUORES2E3E3ZoGJMTh+XpH5iw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WlGMzAWZsqx9YPBpAUtWso7hnpr6zx6XZWjr5O39SHgeRDbKmlLt55u4eAAdfNel+ EJx8QA09ncnchDkVin0ycWtNNjTcJAIqkyxzC5FfBxoOdsH/z2oBP8s1P6yKFZ5VSR R4MrNomj8MRCZcA5Vdpo147IiWs28UkQcceN0n2M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gaosheng Cui , John Johansen , Sasha Levin Subject: [PATCH 5.4 240/658] apparmor: fix a memleak in multi_transaction_new() Date: Mon, 16 Jan 2023 16:45:28 +0100 Message-Id: <20230116154920.538790685@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154909.645460653@linuxfoundation.org> References: <20230116154909.645460653@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Gaosheng Cui [ Upstream commit c73275cf6834787ca090317f1d20dbfa3b7f05aa ] In multi_transaction_new(), the variable t is not freed or passed out on the failure of copy_from_user(t->data, buf, size), which could lead to a memleak. Fix this bug by adding a put_multi_transaction(t) in the error path. Fixes: 1dea3b41e84c5 ("apparmor: speed up transactional queries") Signed-off-by: Gaosheng Cui Signed-off-by: John Johansen Signed-off-by: Sasha Levin --- security/apparmor/apparmorfs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index 84daab8ae062..62736465ac82 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -869,8 +869,10 @@ static struct multi_transaction *multi_transaction_new(struct file *file, if (!t) return ERR_PTR(-ENOMEM); kref_init(&t->count); - if (copy_from_user(t->data, buf, size)) + if (copy_from_user(t->data, buf, size)) { + put_multi_transaction(t); return ERR_PTR(-EFAULT); + } return t; } -- 2.35.1