Re: [PATCH] cifs: Mangle string used for unc in /proc/mounts

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On Thu, 13 Sep 2012 17:48:57 +0100
Sachin Prabhu <sprabhu@xxxxxxxxxx> wrote:

> The string for "unc=" in /proc/mounts needs to be escaped. The current
> behaviour can create problems in cases when mounting a share starting
> with a number.
> 
> example:
> >mount -t cifs -o username=test,password=x vm140-31:/17000-test /mnt
> >mount -o remount,password=x /mnt
> mount error: could not resolve address for vm140-31x00-test: Unknown
> error
> 
> The sub-string "\170" which is part of the unc for the mount above in
> /proc/mounts is interpreted as character'x' in the case above. Escaping
> the string fixes the problem.
> 
> Signed-off-by: Sachin Prabhu <sprabhu@xxxxxxxxxx>
> ---
>  fs/cifs/cifsfs.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> index db8a404..2ac02aa 100644
> --- a/fs/cifs/cifsfs.c
> +++ b/fs/cifs/cifsfs.c
> @@ -360,7 +360,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
>  	cifs_show_security(s, tcon->ses->server);
>  	cifs_show_cache_flavor(s, cifs_sb);
>  
> -	seq_printf(s, ",unc=%s", tcon->treeName);
> +	seq_printf(s, ",unc=");
> +	seq_escape(s, tcon->treeName, " \t\n\\");
>  
>  	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
>  		seq_printf(s, ",multiuser");

Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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