linux-kernel - Re: [PATCH v4 1/3] xattr: add simple initxattrs function

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Date:   Sun, 8 Jan 2017 01:55:11 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     David Graziano <david.graziano@...kwellcollins.com>
Cc:     linux-security-module@...r.kernel.org, paul@...l-moore.com,
        agruenba@...hat.com, hch@...radead.org, linux-mm@...ck.org,
        sds@...ho.nsa.gov, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] xattr: add simple initxattrs function

> +/*
> + * Callback for security_inode_init_security() for acquiring xattrs.
> + */
> +int simple_xattr_initxattrs(struct inode *inode,
> +			    const struct xattr *xattr_array,
> +			    void *fs_info)
> +{
> +	struct simple_xattrs *xattrs;
> +	const struct xattr *xattr;
> +	struct simple_xattr *new_xattr;
> +	size_t len;
> +
> +	if (!fs_info)
> +		return -ENOMEM;

This probablt should be an EINVAL, and also a WARN_ON_ONCE.

> +	xattrs = (struct simple_xattrs *) fs_info;

No need for the cast.  In fact we should probably just declarate it
as struct simple_xattrs *xattrs in the protoype and thus be type safe.

> +
> +	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
> +		new_xattr = simple_xattr_alloc(xattr->value, xattr->value_len);
> +		if (!new_xattr)
> +			return -ENOMEM;

We'll need to unwind the previous allocations here.