linux-kernel - Re: [PATCH v2 1/5] staging: lustre: llite: add support set

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Date:   Tue, 15 May 2018 14:30:35 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     James Simmons <jsimmons@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        NeilBrown <neilb@...e.com>,
        Dmitry Eremin <dmitry.eremin@...el.com>,
        James Simmons <uja.ornl@...oo.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "John L. Hammond" <john.hammond@...el.com>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH v2 1/5] staging: lustre: llite: add support set_acl
 method in inode operations

On Mon, May 14, 2018 at 10:16:59PM -0400, James Simmons wrote:
> +#ifdef CONFIG_FS_POSIX_ACL
>  struct posix_acl *ll_get_acl(struct inode *inode, int type)
>  {
>  	struct ll_inode_info *lli = ll_i2info(inode);
> @@ -3043,6 +3044,64 @@ struct posix_acl *ll_get_acl(struct inode *inode, int type)
>  	return acl;
>  }
>  
> +int ll_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> +{
> +	struct ll_sb_info *sbi = ll_i2sbi(inode);
> +	struct ptlrpc_request *req = NULL;
> +	const char *name = NULL;
> +	size_t value_size = 0;
> +	char *value = NULL;
> +	int rc;

"rc" needs to be initialized to zero.  It's disapppointing that GCC
doesn't catch this.

> +
> +	switch (type) {
> +	case ACL_TYPE_ACCESS:
> +		name = XATTR_NAME_POSIX_ACL_ACCESS;
> +		if (acl)
> +			rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
> +		break;
> +
> +	case ACL_TYPE_DEFAULT:
> +		name = XATTR_NAME_POSIX_ACL_DEFAULT;
> +		if (!S_ISDIR(inode->i_mode))
> +			rc = acl ? -EACCES : 0;
> +		break;
> +
> +	default:
> +		rc = -EINVAL;
> +		break;
> +	}
> +	if (rc)
> +		return rc;

Otherwise rc can be uninitialized here.

regards,
dan carpenter