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SubjectRe: [PATCH] nfsd/nfs4acl: Number of used used array elements needs to be zeroed.
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On Thu, Sep 04, 2008 at 07:40:48PM +0300, Benny Halevy wrote:
> On Sep. 04, 2008, 18:01 +0300, "J. Bruce Fields" <bfields@fieldses.org> wrote:
> > On Thu, Sep 04, 2008 at 04:55:18PM +0200, Jiri Pirko wrote:
> >> Number of used used array elements needs to be zeroed. It may cause
> >> problems otherwise, because it's used uninitialized in find_uid().
> >>
> >> Signed-off-by: Jiri Pirko <jpirko@redhat.com>
> >> ---
> >> fs/nfsd/nfs4acl.c | 2 ++
> >> 1 files changed, 2 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
> >> index 54b8b41..7dcd90f 100644
> >> --- a/fs/nfsd/nfs4acl.c
> >> +++ b/fs/nfsd/nfs4acl.c
> >> @@ -447,11 +447,13 @@ init_state(struct posix_acl_state *state, int cnt)
> >> state->users = kzalloc(alloc, GFP_KERNEL);
> >> if (!state->users)
> >> return -ENOMEM;
> >> + state->users->n = 0;
> >> state->groups = kzalloc(alloc, GFP_KERNEL);
> >> if (!state->groups) {
> >> kfree(state->users);
> >> return -ENOMEM;
> >> }
> >> + state->groups->n = 0;
> >> return 0;
> >> }
> >
> > Thanks for the extra eyes on this code, but: surely the kzalloc()'s are
> > all that's necessary? Am I missing something?
>
> quickly browsing over the code, shouldn't it be:
>
> diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
> index b6ed383..54b8b41 100644
> --- a/fs/nfsd/nfs4acl.c
> +++ b/fs/nfsd/nfs4acl.c
> @@ -443,7 +443,7 @@ init_state(struct posix_acl_state *state, int cnt)
> * enough space for either:
> */
> alloc = sizeof(struct posix_ace_state_array)
> - + cnt*sizeof(struct posix_ace_state);
> + + cnt*sizeof(struct posix_user_ace_state);
> state->users = kzalloc(alloc, GFP_KERNEL);
> if (!state->users)
> return -ENOMEM;

Yep, see 91b80969ba466ba4b915a4a1d03add8c297add3f.--b.


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