linux-kernel - Re: [PATCH 1/2] IB/sysfs: fix NULL dereference

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Date:	Tue, 7 Jun 2016 07:48:03 -0400
From:	Doug Ledford <dledford@...hat.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH 1/2] IB/sysfs: fix NULL dereference

On 6/5/2016 4:13 PM, Sudip Mukherjee wrote:
> If stats->names is NULL or stats->num_counters <= 0 we are jumping to
> the error path where the for loop is freeing hsag->attrs[i]. But as i
> is initialized to 0 so i >= 0 will be true and the loop will execute
> once trying to free hsag->attrs[0]. But hsag is NULL still now leading
> to a NULL pointer dereference.
> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
> ---
>  drivers/infiniband/core/sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
> index 5e573bb..fcf6f9c 100644
> --- a/drivers/infiniband/core/sysfs.c
> +++ b/drivers/infiniband/core/sysfs.c
> @@ -891,7 +891,7 @@ static void setup_hw_stats(struct ib_device *device, struct ib_port *port,
>  {
>  	struct attribute_group *hsag = NULL;
>  	struct rdma_hw_stats *stats;
> -	int i = 0, ret;
> +	int i = -1, ret;
>  
>  	stats = device->alloc_hw_stats(device, port_num);
>  
> 

This issue was fixed in a different way and this patch is no longer
applicable.



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