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 CA42C6FA1 for ; Mon, 3 Apr 2023 14:48:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53EF7C433EF; Mon, 3 Apr 2023 14:48:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680533299; bh=pkdR9FVXp1LVoAXJptwtc5yNL23uIonJqz8nKWsdv/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ccZFdPPELCVczM74NOPiiGLBcTgEMepkWXfkNXF/g1mqCAsKKcqekh4Hy8YPOEt2h v64yjcAbg0u4X7wDOf52ROpBxQkC8cZnFVVN9X1SLCHzGZmcvjA2i2EyYTFkngBCpY zTo+6xAi3phWuwlyxMAuyGBCa69LLPWxp/lRLrkE= 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 6.2 131/187] cifs: prevent infinite recursion in CIFSGetDFSRefer() Date: Mon, 3 Apr 2023 16:09:36 +0200 Message-Id: <20230403140420.294831781@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140416.015323160@linuxfoundation.org> References: <20230403140416.015323160@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 09ba47b44d26b475bbdf9c80db9e0193d2b58956 upstream. We can't call smb_init() in CIFSGetDFSRefer() as cifs_reconnect_tcon() may end up calling CIFSGetDFSRefer() again to get new DFS referrals and thus causing an infinite recursion. Signed-off-by: Paulo Alcantara (SUSE) Reviewed-by: Ronnie Sahlberg Cc: stable@vger.kernel.org # 6.2 Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/cifssmb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -4377,8 +4377,13 @@ CIFSGetDFSRefer(const unsigned int xid, return -ENODEV; getDFSRetry: - rc = smb_init(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, (void **) &pSMB, - (void **) &pSMBr); + /* + * Use smb_init_no_reconnect() instead of smb_init() as + * CIFSGetDFSRefer() may be called from cifs_reconnect_tcon() and thus + * causing an infinite recursion. + */ + rc = smb_init_no_reconnect(SMB_COM_TRANSACTION2, 15, ses->tcon_ipc, + (void **)&pSMB, (void **)&pSMBr); if (rc) return rc;