[Cluster-devel] [PATCH 3/8] cifs: Fix removexattr for os2.* xattrs

[Steve French]

merged into cifs-2.6.git

checkpatch complained about comment formatting so I cleaned that up in
attached trivial followon patch.

On Wed, Apr 13, 2016 at 5:30 PM, Andreas Gruenbacher
<agruenba at redhat.com> wrote:
> If cifs_removexattr finds a "user." or "os2." xattr name prefix, it
> skips 5 bytes, one byte too many for "os2.".
>
> Signed-off-by: Andreas Gruenbacher <agruenba at redhat.com>
> ---
>  fs/cifs/xattr.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
>
> diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
> index 6e73ba9..721c6db 100644
> --- a/fs/cifs/xattr.c
> +++ b/fs/cifs/xattr.c
> @@ -61,15 +61,7 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
>         }
>         if (ea_name == NULL) {
>                 cifs_dbg(FYI, "Null xattr names not supported\n");
> -       } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
> -               && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
> -               cifs_dbg(FYI,
> -                        "illegal xattr request %s (only user namespace supported)\n",
> -                        ea_name);
> -               /* BB what if no namespace prefix? */
> -               /* Should we just pass them to server, except for
> -               system and perhaps security prefixes? */
> -       } else {
> +       } else if (!strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) {
>                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
>                         goto remove_ea_exit;
>
> @@ -78,6 +70,22 @@ int cifs_removexattr(struct dentry *direntry, const char *ea_name)
>                         rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
>                                 full_path, ea_name, NULL, (__u16)0,
>                                 cifs_sb->local_nls, cifs_remap(cifs_sb));
> +       } else if (!strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)) {
> +               if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
> +                       goto remove_ea_exit;
> +
> +               ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
> +               if (pTcon->ses->server->ops->set_EA)
> +                       rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
> +                               full_path, ea_name, NULL, (__u16)0,
> +                               cifs_sb->local_nls, cifs_remap(cifs_sb));
> +       } else {
> +               cifs_dbg(FYI,
> +                        "illegal xattr request %s (only user namespace supported)\n",
> +                        ea_name);
> +               /* BB what if no namespace prefix? */
> +               /* Should we just pass them to server, except for
> +               system and perhaps security prefixes? */
>         }
>  remove_ea_exit:
>         kfree(full_path);
> --
> 2.4.11
>
> --
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-- 
Thanks,

Steve
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