Hi, Sorry for the delay (I'd got some problem in my procmailrc file, and miss this mail).
The new patch, with title "[PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem_get()", has been sent. On Thu, Dec 22, 2016 at 10:00:57AM +0200, Mark Bloch wrote: > Date: Thu, 22 Dec 2016 10:00:57 +0200 > From: Mark Bloch <[email protected]> > To: Kenneth Lee <[email protected]>, [email protected], > [email protected], [email protected] > CC: [email protected], [email protected], [email protected], > [email protected], [email protected], [email protected], > [email protected], [email protected], [email protected], > [email protected] > Subject: Re: [PATCH] ib umem: bug: put pid back before return from error > path > User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 > Thunderbird/45.5.1 > Message-ID: <[email protected]> > > Hi, > > You have two bugs here: > 1) When using ODP, ib_umem_release() checks for umem->odp_data != NULL > calls ib_umem_odp_release() and returns immediately without calling > put_pid(). > This one isn't in the error path so the title doesn't fit. > > 2) In case the allocation failed, we return in -ENOMEM without calling > put_pid(). > > Can you please resend this with proper fixes line and a better description of > what is going on. > > On 22/12/2016 09:11, Kenneth Lee wrote: > > I catched this bug when reading the code. I'm sorry I have no hardware to > > test > > it. But it is abviously a bug. > > > > Signed-off-by: Kenneth Lee <[email protected]> > > --- > > drivers/infiniband/core/umem.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c > > index 1e62a5f..4609b92 100644 > > --- a/drivers/infiniband/core/umem.c > > +++ b/drivers/infiniband/core/umem.c > > @@ -134,6 +134,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext > > *context, unsigned long addr, > > IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND)); > > > > if (access & IB_ACCESS_ON_DEMAND) { > > + put_pid(umem->pid); > > ret = ib_umem_odp_get(context, umem); > > if (ret) { > > kfree(umem); > > @@ -149,6 +150,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext > > *context, unsigned long addr, > > > > page_list = (struct page **) __get_free_page(GFP_KERNEL); > > if (!page_list) { > > + put_pid(umem->pid); > > kfree(umem); > > return ERR_PTR(-ENOMEM); > > } > > > > Mark. -- -Kenneth(Hisilicon)
