Re: [PATCH] tmpfs: fix uninitialized return value in shmem_link

[Hugh Dickins]

On Thu, Feb 21, 2019 at 2:21 PM Darrick J. Wong <darrick.wong@xxxxxxxxxx> wrote:
>
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> When we made the shmem_reserve_inode call in shmem_link conditional, we
> forgot to update the declaration for ret so that it always has a known
> value.  Dan Carpenter pointed out this deficiency in the original patch.
>
> Fixes: "tmpfs: fix link accounting when a tmpfile is linked in"
> Reported-by: dan.carpenter@xxxxxxxxxx
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Gosh, yes indeed: thanks Dan and Darrick, I'm very sorry for not noticing that.
Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
(and sorry if this mail is garbled: it's from gmail, I cannot use
alpine at the moment).

> ---
>  mm/shmem.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 0905215fb016..2c012eee133d 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2848,7 +2848,7 @@ static int shmem_create(struct inode *dir, struct dentry *dentry, umode_t mode,
>  static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
>  {
>         struct inode *inode = d_inode(old_dentry);
> -       int ret;
> +       int ret = 0;
>
>         /*
>          * No ordinary (disk based) filesystem counts links as inodes;