From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90BACC77B72 for ; Wed, 12 Apr 2023 08:52:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231375AbjDLIwr (ORCPT ); Wed, 12 Apr 2023 04:52:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231435AbjDLIwl (ORCPT ); Wed, 12 Apr 2023 04:52:41 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D63ACA261 for ; Wed, 12 Apr 2023 01:52:21 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 97141631A2 for ; Wed, 12 Apr 2023 08:52:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A761EC433EF; Wed, 12 Apr 2023 08:52:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681289533; bh=fKQcmOW7lVE7e+n5uy+SlDK8wzWCQV/JbfPWJtZSYoY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bhXI8zvTfBFqpK6Mwua52rZSKsB2+9xcr72p5Ev4m4m0ZSl/FBHeM3JJ7BdgKg7YG IgExXtOwGuD0IOqefgwX68urU3wGvNceO7fQPxDz5JM7ALO2klzH9rh9Fpsyau4W3c R0r02JNZCSZEoGhHq/R8YFnmccQYHzsGN8/Jg790= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Paulo Alcantara (SUSE)" , Thiago Rafael Becker , Steve French , Sasha Levin Subject: [PATCH 6.2 136/173] cifs: sanitize paths in cifs_update_super_prepath. Date: Wed, 12 Apr 2023 10:34:22 +0200 Message-Id: <20230412082843.629666053@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230412082838.125271466@linuxfoundation.org> References: <20230412082838.125271466@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Thiago Rafael Becker [ Upstream commit d19342c6609b67f2ba83b9eccca2777e3687f625 ] After a server reboot, clients are failing to move files with ENOENT. This is caused by DFS referrals containing multiple separators, which the server move call doesn't recognize. v1: Initial patch. v2: Move prototype to header. Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182472 Fixes: a31080899d5f ("cifs: sanitize multiple delimiters in prepath") Actually-Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api") Reviewed-by: Paulo Alcantara (SUSE) Signed-off-by: Thiago Rafael Becker Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/fs_context.c | 13 +++++++------ fs/cifs/fs_context.h | 3 +++ fs/cifs/misc.c | 2 +- 3 files changed, 11 insertions(+), 7 deletions(-) diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c index 6d13f8207e96a..ace11a1a7c8ab 100644 --- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -441,13 +441,14 @@ int smb3_parse_opt(const char *options, const char *key, char **val) * but there are some bugs that prevent rename from working if there are * multiple delimiters. * - * Returns a sanitized duplicate of @path. The caller is responsible for - * cleaning up the original. + * Returns a sanitized duplicate of @path. @gfp indicates the GFP_* flags + * for kstrdup. + * The caller is responsible for freeing the original. */ #define IS_DELIM(c) ((c) == '/' || (c) == '\\') -static char *sanitize_path(char *path) +char *cifs_sanitize_prepath(char *prepath, gfp_t gfp) { - char *cursor1 = path, *cursor2 = path; + char *cursor1 = prepath, *cursor2 = prepath; /* skip all prepended delimiters */ while (IS_DELIM(*cursor1)) @@ -469,7 +470,7 @@ static char *sanitize_path(char *path) cursor2--; *(cursor2) = '\0'; - return kstrdup(path, GFP_KERNEL); + return kstrdup(prepath, gfp); } /* @@ -531,7 +532,7 @@ smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) if (!*pos) return 0; - ctx->prepath = sanitize_path(pos); + ctx->prepath = cifs_sanitize_prepath(pos, GFP_KERNEL); if (!ctx->prepath) return -ENOMEM; diff --git a/fs/cifs/fs_context.h b/fs/cifs/fs_context.h index 3de00e7127ec4..f4eaf85589022 100644 --- a/fs/cifs/fs_context.h +++ b/fs/cifs/fs_context.h @@ -287,4 +287,7 @@ extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb); */ #define SMB3_MAX_DCLOSETIMEO (1 << 30) #define SMB3_DEF_DCLOSETIMEO (1 * HZ) /* even 1 sec enough to help eg open/write/close/open/read */ + +extern char *cifs_sanitize_prepath(char *prepath, gfp_t gfp); + #endif diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 5542893ef03f7..2fae6b08314d9 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -1297,7 +1297,7 @@ int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix) kfree(cifs_sb->prepath); if (prefix && *prefix) { - cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC); + cifs_sb->prepath = cifs_sanitize_prepath(prefix, GFP_ATOMIC); if (!cifs_sb->prepath) return -ENOMEM; -- 2.39.2