Cc'ing Olga.--b.
On Tue, Jul 17, 2018 at 10:33:59AM +0100, Colin Ian King wrote:
> On 17/07/18 10:30, Dan Carpenter wrote:
> > On Mon, Jul 16, 2018 at 01:09:54PM +0100, Colin King wrote:
> >> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> >>
> >> In the case where async_copy is successfully allocated but
> >> the call to nfs4_init_cp_state fails, async_copy is not
> >> currently freed and the memory is leaked. Fix this by kfree'ing
> >> it before returning.
> >>
> >> Detected by CoverityScan, CID#1471823 ("Resource leak")
> >>
> >> Fixes: beb1814d5a8a ("NFSD create new stateid for async copy")
> >> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> >> ---
> >> fs/nfsd/nfs4proc.c | 4 +++-
> >> 1 file changed, 3 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
> >> index 8f3368353aaf..3fb96a2708b9 100644
> >> --- a/fs/nfsd/nfs4proc.c
> >> +++ b/fs/nfsd/nfs4proc.c
> >> @@ -1295,8 +1295,10 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> >> async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
> >> if (!async_copy)
> >> goto out;
> >> - if (!nfs4_init_cp_state(nn, copy))
> >> + if (!nfs4_init_cp_state(nn, copy)) {
> >> + kfree(async_copy);
> >> goto out;
> >
> > It really feels like both this and the kzalloc() failure should be doing
> > an of fput() of copy->file_src and copy->file_dst. The goto out_err
> > does an list_del(©->copies); but it happens before the
> > "list_add(&async_copy->copies ..." so that's likely wrong as well.
>
> Good observation, thanks for spotting that. I suspect I'm a bit out of
> my depth figuring out the exact error handling reaping steps here.
> Perhaps this is one for the maintainers to figure out a safe cleanup on
> these error paths.
>
> >
> > regards,
> > dan carpenter
> >
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