Re: [patch] cifs: update limit for snprintf() in cifs_construct_tcon()

[walter harms <wharms@bfs.de>]

Am 17.06.2011 12:31, schrieb Dan Carpenter:
> In 34c87901e113 "Shrink stack space usage in cifs_construct_tcon" we
> change the size of the username name buffer from MAX_USERNAME_SIZE
> (256) to 28.  This call to snprintf() needs to be updated as well.
> 
> Signed-off-by: Dan Carpenter <error27@gmail.com>
> ---
> I know that everyone is going to complain about using a literal but
> it's local to this function and it's commented in the lines above.
> I'm not opposed to using a define, I suppose, if you give me a good
> one, but really I'd just as soon leave it as is.  *eye roll in
> advance*.
> 
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 12cf72d..efd1c7a 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -3451,7 +3451,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
>  		goto out;
>  	}
>  
> -	snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
> +	snprintf(username, 28, "krb50x%x", fsuid);
>  	vol_info->username = username;
>  	vol_info->local_nls = cifs_sb->local_nls;
>  	vol_info->linux_uid = fsuid;

perhaps we should restrict it in the format also:
  "krb50x%22x"
that would leave the opportunity to have a sane limit,
instead of just cutting.

just my 2 cents,
re,
 wh

just my 2 cents,
re,
 wh



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