From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6E37E288C38; Wed, 2 Jul 2025 14:07:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751465260; cv=none; b=kXj4TnahHgu0WfekMpj9KglZoyz5Ndjicqk0RGdsn0Z1i9kmFe+zzrJblW5+Hz1zfk3CFF1h887RlCC5Nr5/12U+5PmX6NkBimQHXucEJHyNRaIJ3FC+g5FwuP/PjX56viyNBcxdrNwPKISjELlnEG8Ry7t+SCJPzDBdRQMMitk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751465260; c=relaxed/simple; bh=mTghYG16uqf81hPKOPwgfpUOHxtzVIWN9TKCcG0uDPc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AuQBIUxsp98KykberdWuabJ2JysNG8nESI/ePtPL19eofV2ifIEVBSkq1LKgG5awiNFUIFqAKkwrnO/bVxmyt2Z50tB9BnTH1cKNxxK50DcPveCHlCx9ByXTHvr2cR2P4jTevnvwgD69NYveCGj56ej69q8nYE/0etteM87EHg8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NrwU8sxA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NrwU8sxA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 716E2C4CEE7; Wed, 2 Jul 2025 14:07:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751465259; bh=mTghYG16uqf81hPKOPwgfpUOHxtzVIWN9TKCcG0uDPc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NrwU8sxArSIqCpc3vW31Q6ExWLGXvsz5BcWqIXL/qzjcOGbNASZzSZ5kistqcz/hv DayzgHrmnz59OuVcCCc7gujethjASQ0Rzghh1SAWdB+vdJ8xY+Z01rLbYzmDcMpG8F MCx3+PaXKF2IWWFIDi9PptvLyaBDf+NUQNJRb4dhpySx5VKyvN6ZaaqLW60oo3pE9k 196aI0T12ml5XaSWfcJSBHldMNZX5AD7B6M5328HiK+KJxwOJrs3VN38bLlNOkdBlZ e5BGkdtEPk34bNbTOTYoOEmd6Pf42705Dp8bhUdEKstQjPka2MxrFrIjR3Ae/ZgAYf ETHLFbAVaK6Bw== Date: Wed, 2 Jul 2025 15:07:35 +0100 From: Simon Horman To: Leon Romanovsky Cc: Jason Gunthorpe , Stav Aviram , Andrew Lunn , Eric Dumazet , Jakub Kicinski , linux-rdma@vger.kernel.org, Mark Bloch , netdev@vger.kernel.org, Paolo Abeni , Saeed Mahameed , Tariq Toukan , Michal Swiatkowski Subject: Re: [PATCH mlx5-next v1] net/mlx5: Check device memory pointer before usage Message-ID: <20250702140735.GE41770@horms.kernel.org> References: <20250701193858.GA41770@horms.kernel.org> <20250702082847.GH6278@unreal> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250702082847.GH6278@unreal> On Wed, Jul 02, 2025 at 11:28:47AM +0300, Leon Romanovsky wrote: > On Tue, Jul 01, 2025 at 08:38:58PM +0100, Simon Horman wrote: > > On Tue, Jul 01, 2025 at 03:08:12PM +0300, Leon Romanovsky wrote: > > > From: Stav Aviram > > > > > > Add a NULL check before accessing device memory to prevent a crash if > > > dev->dm allocation in mlx5_init_once() fails. > > > > > > Fixes: c9b9dcb430b3 ("net/mlx5: Move device memory management to mlx5_core") > > > Signed-off-by: Stav Aviram > > > Signed-off-by: Leon Romanovsky > > > --- > > > Changelog: > > > v1: > > > * Removed extra IS_ERR(dm) check. > > > v0: > > > https://lore.kernel.org/all/e389fa6ef075af1049cd7026b912d736ebe3ad23.1751279408.git.leonro@nvidia.com > > > --- > > > drivers/infiniband/hw/mlx5/dm.c | 2 +- > > > drivers/net/ethernet/mellanox/mlx5/core/lib/dm.c | 4 ++-- > > > drivers/net/ethernet/mellanox/mlx5/core/main.c | 2 +- > > > 3 files changed, 4 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/infiniband/hw/mlx5/dm.c b/drivers/infiniband/hw/mlx5/dm.c > > > index b4c97fb62abf..9ded2b7c1e31 100644 > > > --- a/drivers/infiniband/hw/mlx5/dm.c > > > +++ b/drivers/infiniband/hw/mlx5/dm.c > > > @@ -282,7 +282,7 @@ static struct ib_dm *handle_alloc_dm_memic(struct ib_ucontext *ctx, > > > int err; > > > u64 address; > > > > > > - if (!MLX5_CAP_DEV_MEM(dm_db->dev, memic)) > > > + if (!dm_db || !MLX5_CAP_DEV_MEM(dm_db->dev, memic)) > > > return ERR_PTR(-EOPNOTSUPP); > > > > nit: -EOPNOTSUPP doesn't feel like the right error code > > in the !dm_db case. > > Why? This error is returned to the user through mlx5_ib_alloc_dm(). Because, as I understand things, such a case would be due to a memory allocation failure, not by the device not supporting a feature. handle_alloc_dm_memic() already returns ERR_PTR(-ENOMEM) if kzalloc() fails. I'd suggest doing so for the !dm_db case too. But I don't feel particularly strongly about this.