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Date: Tue, 3 Jun 2014 17:10:04 +0200
From: =?iso-8859-1?Q?Beno=EEt?= Canet <benoit.canet@irqsave.net>
Message-ID: <20140603151003.GC21314@irqsave.net>
References: <1401801062-9154-1-git-send-email-kwolf@redhat.com>
	<1401801062-9154-9-git-send-email-kwolf@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3 08/21] nfs: Handle failure for
 potentially large allocations
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To: Kevin Wolf <kwolf@redhat.com>
Cc: benoit.canet@irqsave.net, mreitz@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, armbru@redhat.com

The Tuesday 03 Jun 2014 =E0 15:10:49 (+0200), Kevin Wolf wrote :
> Some code in the block layer makes potentially huge allocations. Failur=
e
> is not completely unexpected there, so avoid aborting qemu and handle
> out-of-memory situations gracefully.
>=20
> This patch addresses the allocations in the nfs block driver.
>=20
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  block/nfs.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>=20
> diff --git a/block/nfs.c b/block/nfs.c
> index 539bd95..b37316f 100644
> --- a/block/nfs.c
> +++ b/block/nfs.c
> @@ -165,7 +165,11 @@ static int coroutine_fn nfs_co_writev(BlockDriverS=
tate *bs,
> =20
>      nfs_co_init_task(client, &task);
> =20
> -    buf =3D g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
> +    buf =3D g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
> +    if (nb_sectors && buf =3D=3D NULL) {
> +        return -ENOMEM;
> +    }
> +
>      qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
> =20
>      if (nfs_pwrite_async(client->context, client->fh,
> --=20
> 1.8.3.1
>=20
>=20
Reviewed-by: Benoit Canet <benoit@irqsave.net>