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 4BEBA33EC for ; Mon, 16 Jan 2023 15:56:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C647AC433D2; Mon, 16 Jan 2023 15:56:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673884613; bh=3wwBBVkWstLN0luvKBxUywDjCehgOV5OpIoKRTbN4UI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JmfXCzJgIPJcF0uZC0kqm3vUQJUoHclzdJ1QB0+u1ssojFl/Y5l0ekms458oOR+M+ E/BoHB4CmSf+XpmbvPKwML5nQsR1Dwj3mRhSLu5nUVglRn1BHvrakve1Pgm0kAOcj6 dd5wUD9Des0kRdjKvnlV66kTiB7MoDoREe0avrDM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Paulo Alcantara (SUSE)" , Ronnie Sahlberg , Steve French Subject: [PATCH 6.1 042/183] cifs: fix double free on failed kerberos auth Date: Mon, 16 Jan 2023 16:49:25 +0100 Message-Id: <20230116154805.164086133@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154803.321528435@linuxfoundation.org> References: <20230116154803.321528435@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: Paulo Alcantara commit 39e8db3c860e2678ce5a7d74193925876507c9eb upstream. If session setup failed with kerberos auth, we ended up freeing cifs_ses::auth_key.response twice in SMB2_auth_kerberos() and sesInfoFree(). Fix this by zeroing out cifs_ses::auth_key.response after freeing it in SMB2_auth_kerberos(). Fixes: a4e430c8c8ba ("cifs: replace kfree() with kfree_sensitive() for sensitive data") Signed-off-by: Paulo Alcantara (SUSE) Acked-by: Ronnie Sahlberg Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/smb2pdu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1479,8 +1479,11 @@ SMB2_auth_kerberos(struct SMB2_sess_data out_put_spnego_key: key_invalidate(spnego_key); key_put(spnego_key); - if (rc) + if (rc) { kfree_sensitive(ses->auth_key.response); + ses->auth_key.response = NULL; + ses->auth_key.len = 0; + } out: sess_data->result = rc; sess_data->func = NULL;