Re: [PATCH][next] fs: Fix uninitialized scalar variable now

[Everest K.C.]

On Wed, Oct 9, 2024 at 2:45 PM Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
>
> On Wed, Oct 09, 2024 at 02:05:25PM -0600, Everest K.C. wrote:
> > Variable `now` is declared without initialization. The variable
> > could be accessed inside the if-else statements following the
> > variable declaration, before it has been initialized.
> >
> > This patch initializes the variable to
> > `inode_set_ctime_current(inode)` by default.
> >
> > This issue was reported by Coverity Scan.
> >
> > Signed-off-by: Everest K.C. <everestkc@xxxxxxxxxxxxxxxx>
>
> Fixes: d8d11298e8a1 ("fs: handle delegated timestamps in setattr_copy_mgtime")
>
> Maybe the WARN_ON_ONCE() should be updated to check ATTR_ATIME as well?
I am not sure about that, but even if that is necessary. I think it
should be handled in a different patch.
> regards,
> dan carpenter
>
> > ---
> >  fs/attr.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/fs/attr.c b/fs/attr.c
> > index c614b954bda5..77523af2e62d 100644
> > --- a/fs/attr.c
> > +++ b/fs/attr.c
> > @@ -284,7 +284,7 @@ EXPORT_SYMBOL(inode_newsize_ok);
> >  static void setattr_copy_mgtime(struct inode *inode, const struct iattr *attr)
> >  {
> >       unsigned int ia_valid = attr->ia_valid;
> > -     struct timespec64 now;
> > +     struct timespec64 now = inode_set_ctime_current(inode);
> >
> >       if (ia_valid & ATTR_CTIME) {
> >               /*
> > @@ -293,8 +293,6 @@ static void setattr_copy_mgtime(struct inode *inode, const struct iattr *attr)
> >                */
> >               if (ia_valid & ATTR_DELEG)
> >                       now = inode_set_ctime_deleg(inode, attr->ia_ctime);
> > -             else
> > -                     now = inode_set_ctime_current(inode);
> >       } else {
> >               /* If ATTR_CTIME isn't set, then ATTR_MTIME shouldn't be either. */
> >               WARN_ON_ONCE(ia_valid & ATTR_MTIME);
> > --
> > 2.43.0
> >