linux-kernel - Re: [PATCH net v2] net/mlx5e: Fix NULL deref in mlx5e_tir_builder

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Message-ID: <17f3baee-c654-4e6f-a5d4-ba0899fe2385@gmail.com>
Date: Wed, 25 Sep 2024 08:49:11 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Elena Salomatkina <esalomatkina@...ras.ru>,
 Saeed Mahameed <saeedm@...dia.com>
Cc: Leon Romanovsky <leon@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxim Mikityanskiy <maximmi@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
 Maor Dickman <maord@...dia.com>, netdev@...r.kernel.org,
 linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net/mlx5e: Fix NULL deref in
 mlx5e_tir_builder_alloc()

On 24/09/2024 19:00, Elena Salomatkina wrote:
> In mlx5e_tir_builder_alloc() kvzalloc() may return NULL
> which is dereferenced on the next line in a reference
> to the modify field.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: a6696735d694 ("net/mlx5e: Convert TIR to a dedicated object")
> Signed-off-by: Elena Salomatkina <esalomatkina@...ras.ru>
> ---
> v2: Fix tab, add blank line
> 
>   drivers/net/ethernet/mellanox/mlx5/core/en/tir.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tir.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tir.c
> index d4239e3b3c88..11f724ad90db 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tir.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tir.c
> @@ -23,6 +23,9 @@ struct mlx5e_tir_builder *mlx5e_tir_builder_alloc(bool modify)
>   	struct mlx5e_tir_builder *builder;
>   
>   	builder = kvzalloc(sizeof(*builder), GFP_KERNEL);
> +	if (!builder)
> +		return NULL;
> +
>   	builder->modify = modify;
>   
>   	return builder;

Thanks for your patch.

Reviewed-by: Tariq Toukan <tariqt@...dia.com>