From: Joseph Qi <joseph.qi@linux.alibaba.com>
To: Jia-Ju Bai <baijiaju1990@gmail.com>, mark@fasheh.com, jlbec@evilplan.org
Cc: ocfs2-devel@oss.oracle.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] fs: ocfs2: Fix a possible null-pointer dereference in ocfs2_write_end_nolock()
Date: Fri, 26 Jul 2019 17:38:10 +0800 [thread overview]
Message-ID: <cdec8b79-a854-e9b0-21af-897c7eedc454@linux.alibaba.com> (raw)
In-Reply-To: <20190726033705.32307-1-baijiaju1990@gmail.com>
On 19/7/26 11:37, Jia-Ju Bai wrote:
> In ocfs2_write_end_nolock(), there are an if statement on lines 1976,
> 2047 and 2058, to check whether handle is NULL:
> if (handle)
>
> When handle is NULL, it is used on line 2045:
> ocfs2_update_inode_fsync_trans(handle, inode, 1);
> oi->i_sync_tid = handle->h_transaction->t_tid;
>
> Thus, a possible null-pointer dereference may occur.
>
> To fix this bug, handle is checked before calling
> ocfs2_update_inode_fsync_trans().
>
> This bug is found by a static analysis tool STCheck written by us.
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Looks good.
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
> ---
> fs/ocfs2/aops.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
> index a4c905d6b575..5473bd99043e 100644
> --- a/fs/ocfs2/aops.c
> +++ b/fs/ocfs2/aops.c
> @@ -2042,7 +2042,8 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
> inode->i_mtime = inode->i_ctime = current_time(inode);
> di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
> di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
> - ocfs2_update_inode_fsync_trans(handle, inode, 1);
> + if (handle)
> + ocfs2_update_inode_fsync_trans(handle, inode, 1);
> }
> if (handle)
> ocfs2_journal_dirty(handle, wc->w_di_bh);
>
next prev parent reply other threads:[~2019-07-26 9:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-26 3:37 [PATCH 2/3] fs: ocfs2: Fix a possible null-pointer dereference in ocfs2_write_end_nolock() Jia-Ju Bai
2019-07-26 9:38 ` Joseph Qi [this message]
2019-08-05 2:38 ` [Ocfs2-devel] " Changwei Ge
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=cdec8b79-a854-e9b0-21af-897c7eedc454@linux.alibaba.com \
--to=joseph.qi@linux.alibaba.com \
--cc=baijiaju1990@gmail.com \
--cc=jlbec@evilplan.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mark@fasheh.com \
--cc=ocfs2-devel@oss.oracle.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).