linux-kernel - Re: [PATCH 2/2 linux-next] FS/HFSPLUS: move xattr_name allocation in hfsplus

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Date:	Tue, 3 Mar 2015 19:04:25 +0100 (CET)
From:	Fabian Frederick <fabf@...net.be>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 linux-next] FS/HFSPLUS: move xattr_name allocation
 in hfsplus_setxattr()



> On 02 March 2015 at 23:25 Andrew Morton <akpm@...ux-foundation.org> wrote:
>
>
> On Fri, 27 Feb 2015 18:38:26 +0100 Fabian Frederick <fabf@...net.be> wrote:
>
> > security/trusted/user/osx setxattr did the same
> > xattr_name initialization. Move that operation in hfsplus_setxattr().
> >
> > Tested with security/trusted/user getfattr/setfattr
> >
> > --- a/fs/hfsplus/xattr.c
> > +++ b/fs/hfsplus/xattr.c
> > @@ -424,6 +424,28 @@ static int copy_name(char *buffer, const char
> > *xattr_name, int name_len)
> >     return len;
> >  }
> > 
> > +int hfsplus_setxattr(struct dentry *dentry, const char *name,
> > +                const void *value, size_t size, int flags,
> > +                const char *prefix, size_t prefixlen)
> > +{
> > +   char *xattr_name;
> > +   int res;
> > +
> > +   if (!strcmp(name, ""))
> > +           return -EINVAL;
> > +
> > +   xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
> > +           GFP_KERNEL);
> > +   if (!xattr_name)
> > +           return -ENOMEM;
> > +   strcpy(xattr_name, prefix);
> > +   strcpy(xattr_name + prefixlen, name);
>
> Can we use kasprintf(GFP_KERNEL, "%s%s", prefix, name) and zap `prefixlen'?
Of course :) Thanks Andrew, I'll send a small patchset for relevant filesystems.

Regards,
Fabian
>
> > +   res = __hfsplus_setxattr(dentry->d_inode, xattr_name, value, size,
> > +                            flags);
> > +   kfree(xattr_name);
> > +   return res;
> > +}
>
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