From: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
To: Dan Carpenter <dan.carpenter@oracle.com>,
Colin King <colin.king@canonical.com>
Cc: Seth Jennings <sjenning@redhat.com>,
Dan Streetman <ddstreet@ieee.org>,
Vitaly Wool <vitaly.wool@konsulko.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"kernel-janitors@vger.kernel.org"
<kernel-janitors@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH][next] mm/zswap: fix a couple of memory leaks and rework kzalloc failure check
Date: Mon, 22 Jun 2020 19:55:14 +0000 [thread overview]
Message-ID: <B926444035E5E2439431908E3842AFD2514C4B@DGGEMI525-MBS.china.huawei.com> (raw)
In-Reply-To: <20200622182816.GF4151@kadam>
> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> Sent: Tuesday, June 23, 2020 6:28 AM
> To: Colin King <colin.king@canonical.com>
> Cc: Seth Jennings <sjenning@redhat.com>; Dan Streetman
> <ddstreet@ieee.org>; Vitaly Wool <vitaly.wool@konsulko.com>; Andrew
> Morton <akpm@linux-foundation.org>; Song Bao Hua (Barry Song)
> <song.bao.hua@hisilicon.com>; Stephen Rothwell <sfr@canb.auug.org.au>;
> linux-mm@kvack.org; kernel-janitors@vger.kernel.org;
> linux-kernel@vger.kernel.org
> Subject: Re: [PATCH][next] mm/zswap: fix a couple of memory leaks and
> rework kzalloc failure check
>
> On Mon, Jun 22, 2020 at 04:35:46PM +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@canonical.com>
> >
> > kzalloc failures return NULL on out of memory errors, so replace the
> > IS_ERR_OR_NULL check with the usual null pointer check. Fix two memory
> > leaks with on acomp and acomp_ctx by ensuring these objects are free'd
> > on the error return path.
> >
> > Addresses-Coverity: ("Resource leak")
> > Fixes: d4f86abd6e35 ("mm/zswap: move to use crypto_acomp API for
> hardware acceleration")
> > Signed-off-by: Colin Ian King <colin.king@canonical.com>
Colin, thanks for your patch. I am sorry I did the same thing with you here:
https://lkml.org/lkml/2020/6/22/347
> > ---
> > mm/zswap.c | 16 +++++++++++-----
> > 1 file changed, 11 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/zswap.c b/mm/zswap.c
> > index 0d914ba6b4a0..14839cbac7ff 100644
> > --- a/mm/zswap.c
> > +++ b/mm/zswap.c
> > @@ -433,23 +433,23 @@ static int zswap_cpu_comp_prepare(unsigned int
> cpu, struct hlist_node *node)
> > return 0;
> >
> > acomp_ctx = kzalloc(sizeof(*acomp_ctx), GFP_KERNEL);
> > - if (IS_ERR_OR_NULL(acomp_ctx)) {
> > + if (!acomp_ctx) {
> > pr_err("Could not initialize acomp_ctx\n");
> > return -ENOMEM;
> > }
> > acomp = crypto_alloc_acomp(pool->tfm_name, 0, 0);
> > - if (IS_ERR_OR_NULL(acomp)) {
> > + if (!acomp) {
>
> This should be IS_ERR(acomp). Please preserve the error code.
>
> > pr_err("could not alloc crypto acomp %s : %ld\n",
> > pool->tfm_name, PTR_ERR(acomp));
> > - return -ENOMEM;
> > + goto free_acomp_ctx;
> > }
> > acomp_ctx->acomp = acomp;
> >
> > req = acomp_request_alloc(acomp_ctx->acomp);
> > - if (IS_ERR_OR_NULL(req)) {
> > + if (!req) {
> > pr_err("could not alloc crypto acomp %s : %ld\n",
> > pool->tfm_name, PTR_ERR(acomp));
> > - return -ENOMEM;
> > + goto free_acomp;
> > }
> > acomp_ctx->req = req;
> >
> > @@ -462,6 +462,12 @@ static int zswap_cpu_comp_prepare(unsigned int
> cpu, struct hlist_node *node)
> > *per_cpu_ptr(pool->acomp_ctx, cpu) = acomp_ctx;
> >
> > return 0;
> > +
> > +free_acomp:
> > + kfree(acomp);
>
> The kfree() isn't correct. It needs to be:
>
> crypto_free_acomp(acomp);
>
> > +free_acomp_ctx:
> > + kfree(acomp_ctx);
> > + return -ENOMEM;
>
> regards,
> dan carpenter
next prev parent reply other threads:[~2020-06-22 19:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 15:35 [PATCH][next] mm/zswap: fix a couple of memory leaks and rework kzalloc failure check Colin King
2020-06-22 18:28 ` Dan Carpenter
2020-06-22 19:55 ` Song Bao Hua (Barry Song) [this message]
2020-06-23 11:12 ` Colin Ian King
2020-06-23 14:02 ` Vitaly Wool
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