From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Paulo Alcantara <pc@cjr.nz>,
Steve French <stfrench@microsoft.com>,
Sasha Levin <sashal@kernel.org>,
linux-cifs@vger.kernel.org, samba-technical@lists.samba.org
Subject: [PATCH AUTOSEL 5.4 51/51] cifs: prevent NULL deref in cifs_compose_mount_options()
Date: Wed, 14 Jul 2021 15:45:13 -0400 [thread overview]
Message-ID: <20210714194513.54827-51-sashal@kernel.org> (raw)
In-Reply-To: <20210714194513.54827-1-sashal@kernel.org>
From: Paulo Alcantara <pc@cjr.nz>
[ Upstream commit 03313d1c3a2f086bb60920607ab79ac8f8578306 ]
The optional @ref parameter might contain an NULL node_name, so
prevent dereferencing it in cifs_compose_mount_options().
Addresses-Coverity: 1476408 ("Explicit null dereferenced")
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/cifs/cifs_dfs_ref.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index cc3ada12848d..42125601ebb1 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -151,6 +151,9 @@ char *cifs_compose_mount_options(const char *sb_mountdata,
return ERR_PTR(-EINVAL);
if (ref) {
+ if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0))
+ return ERR_PTR(-EINVAL);
+
if (strlen(fullpath) - ref->path_consumed) {
prepath = fullpath + ref->path_consumed;
/* skip initial delimiter */
--
2.30.2
parent reply other threads:[~2021-07-14 19:54 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20210714194513.54827-1-sashal@kernel.org>]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210714194513.54827-51-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=linux-cifs@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pc@cjr.nz \
--cc=samba-technical@lists.samba.org \
--cc=stable@vger.kernel.org \
--cc=stfrench@microsoft.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).