linux-kernel - Re: [PATCH] cifs: dir: fix memory leak in cifs

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Date:   Fri, 20 Apr 2018 12:37:32 -0500
From:   Steve French <smfrench@...il.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Colin King <colin.king@...onical.com>
Cc:     Ronnie Sahlberg <lsahlber@...hat.com>,
        Steve French <sfrench@...ba.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] cifs: dir: fix memory leak in cifs_mknod

I noticed a similar problem with the tcon link leak on that (which
Colin and Gustavo pointed out - thank you!) but also in another return
statement, so updated the original patch of Ronnie's merging the fixes

https://git.samba.org/sfrench/cifs-2.6.git/?p=sfrench/cifs-2.6.git;a=commit;h=167bc5de08dc97695f9d5c7069c3e69f409ff80b


Let me know if you see any problems with it.

On Fri, Apr 20, 2018 at 8:19 AM, Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
> Free allocated memory for full_path and xid before return.
>
> Addresses-Coverity-ID: 1468029 ("Resource leak")
> Fixes: 49162bfde140 ("cifs: do not allow creating sockets except with
> SMB1 posix exensions")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  fs/cifs/dir.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
> index f0a759d..71e32d9 100644
> --- a/fs/cifs/dir.c
> +++ b/fs/cifs/dir.c
> @@ -684,8 +684,11 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
>                 goto mknod_out;
>         }
>
> -       if (!S_ISCHR(mode) && !S_ISBLK(mode))
> +       if (!S_ISCHR(mode) && !S_ISBLK(mode)) {
> +               kfree(full_path);
> +               free_xid(xid);
>                 return -EPERM;
> +       }
>
>         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
>                 goto mknod_out;
> --
> 2.7.4
>
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-- 
Thanks,

Steve

View attachment "0001-cifs-do-not-allow-creating-sockets-except-with-SMB1-.patch" of type "text/x-patch" (2395 bytes)