linux-kernel - Re: [PATCH net] net/mlx5: Fix error handling in mlx5_init_one

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Date: Sun, 12 May 2024 11:20:40 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Simon Horman <horms@...nel.org>
Cc: Shay Drory <shayd@...dia.com>, Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Moshe Shemesh <moshe@...dia.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] net/mlx5: Fix error handling in mlx5_init_one_light()

On Sat, May 11, 2024 at 03:23:04PM +0100, Simon Horman wrote:
> On Thu, May 09, 2024 at 02:00:18PM +0300, Dan Carpenter wrote:
> > If mlx5_query_hca_caps_light() fails then calling devl_unregister() or
> > devl_unlock() is a bug.  It's not registered and it's not locked.  That
> > will trigger a stack trace in this case because devl_unregister() checks
> > both those things at the start of the function.
> > 
> > If mlx5_devlink_params_register() fails then this code will call
> > devl_unregister() and devl_unlock() twice which will again lead to a
> > stack trace or possibly something worse as well.
> > 
> > Fixes: bf729988303a ("net/mlx5: Restore mistakenly dropped parts in register devlink flow")
> > Fixes: c6e77aa9dd82 ("net/mlx5: Register devlink first under devlink lock")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> 
> Hi Dan,
> 
> I believe that after you posted this patch, a different fix for this was
> added to net as:
> 
> 3c453e8cc672 ("net/mlx5: Fix peer devlink set for SF representor devlink port")
> 

Ah good.  Plus that patch has been tested.

regards,
dan carpenter