linux-kernel - Re: linux-next: build warning after merge of the overlayfs tree

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Message-ID: <CAJfpegsb5Qg0Y0SRpDC32tq1w2CBzdwMNip5DN-=QoEsfoqTAA@mail.gmail.com>
Date:   Tue, 22 Nov 2016 09:41:44 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build warning after merge of the overlayfs tree

On Tue, Nov 22, 2016 at 1:19 AM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi Miklos,
>
> After merging the overlayfs tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
>
> In file included from fs/overlayfs/dir.c:20:0:
> fs/overlayfs/dir.c: In function 'ovl_set_redirect':
> fs/overlayfs/overlayfs.h:92:6: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   int err = vfs_setxattr(dentry, name, value, size, flags);
>       ^
> fs/overlayfs/dir.c:788:14: note: 'ret' was declared here
>   char *buf, *ret;
>               ^
>
> Introduced by commit
>
>   496654b0792e ("ovl: redirect on rename-dir")
>
> This is not necessarily a false positive (although is is a confusing
> message): if the kmalloc of "buf" fails and samedir was not set in
> ovl_get_redirect(), then "return ret" will be executed but "ret" has
> not been set.

Fixed. Thanks for reporting.

Miklos