[PATCH] fs/cifs/cifsacl: fix sid_to_id

[PATCH] fs/cifs/cifsacl: fix sid_to_id

[Qiujun Huang]

fix it to return the errcode.

Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
---
 fs/cifs/cifsacl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 716574a..a8d2aa8 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -400,6 +400,7 @@
 	if (!sidstr)
 		return -ENOMEM;
 
+	rc = 0;
 	saved_cred = override_creds(root_cred);
 	sidkey = request_key(&cifs_idmap_key_type, sidstr, "");
 	if (IS_ERR(sidkey)) {
@@ -454,7 +455,7 @@
 		fattr->cf_uid = fuid;
 	else
 		fattr->cf_gid = fgid;
-	return 0;
+	return rc;
 }
 
 int
-- 
1.8.3.1

Re: [PATCH] fs/cifs/cifsacl: fix sid_to_id

[Steve French]

Doesn't rc = 0 have to be set earlier (preferably in the declaration
on line 345)?

since line 392 does
            goto got_valid_id;
which appears to leave rc unitialized with your change

On Tue, Mar 3, 2020 at 9:56 AM Qiujun Huang <hqjagain@gmail.com> wrote:
>
> fix it to return the errcode.
>
> Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
> ---
>  fs/cifs/cifsacl.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
> index 716574a..a8d2aa8 100644
> --- a/fs/cifs/cifsacl.c
> +++ b/fs/cifs/cifsacl.c
> @@ -400,6 +400,7 @@
>         if (!sidstr)
>                 return -ENOMEM;
>
> +       rc = 0;
>         saved_cred = override_creds(root_cred);
>         sidkey = request_key(&cifs_idmap_key_type, sidstr, "");
>         if (IS_ERR(sidkey)) {
> @@ -454,7 +455,7 @@
>                 fattr->cf_uid = fuid;
>         else
>                 fattr->cf_gid = fgid;
> -       return 0;
> +       return rc;
>  }
>
>  int
> --
> 1.8.3.1
>


-- 
Thanks,

Steve

Re: [PATCH] fs/cifs/cifsacl: fix sid_to_id

[Qiujun Huang]

On Wed, Mar 4, 2020 at 4:13 AM Steve French <smfrench@gmail.com> wrote:
>
> Doesn't rc = 0 have to be set earlier (preferably in the declaration
> on line 345)?
>
> since line 392 does
>             goto got_valid_id;
> which appears to leave rc unitialized with your change
>
ok, I noticed that fall back to using the mnt_uid/mnt_gid.

Should we remove the variable 'rc'. It is set but not used. And I was
confused last time. (:

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 716574a..1cf3916 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -342,7 +342,6 @@
 sid_to_id(struct cifs_sb_info *cifs_sb, struct cifs_sid *psid,
                struct cifs_fattr *fattr, uint sidtype)
 {
-       int rc;
        struct key *sidkey;
        char *sidstr;
        const struct cred *saved_cred;
@@ -403,7 +402,6 @@
        saved_cred = override_creds(root_cred);
        sidkey = request_key(&cifs_idmap_key_type, sidstr, "");
        if (IS_ERR(sidkey)) {
-               rc = -EINVAL;
                cifs_dbg(FYI, "%s: Can't map SID %s to a %cid\n",
                         __func__, sidstr, sidtype == SIDOWNER ? 'u' : 'g');
                goto out_revert_creds;
@@ -416,7 +414,6 @@
         */
        BUILD_BUG_ON(sizeof(uid_t) != sizeof(gid_t));
        if (sidkey->datalen != sizeof(uid_t)) {
-               rc = -EIO;
                cifs_dbg(FYI, "%s: Downcall contained malformed key
(datalen=%hu)\n",
                         __func__, sidkey->datalen);
                key_invalidate(sidkey);