linux-kernel - Re: [PATCH] infiniband: cxgb4: fix a potential NULL pointer dereference

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Date:   Wed, 27 Mar 2019 17:43:29 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Steve Wise <swise@...lsio.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband: cxgb4: fix a potential NULL pointer
 dereference


On 3/9/2019 10:49 AM, Kangjie Lu wrote:
> get_skb may fail and return NULL. The fix returns "ENOMEM"
> when it fails to avoid NULL dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>

Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>


> ---
>   drivers/infiniband/hw/cxgb4/cm.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
> index 8221813219e5..502a54d57e2c 100644
> --- a/drivers/infiniband/hw/cxgb4/cm.c
> +++ b/drivers/infiniband/hw/cxgb4/cm.c
> @@ -1919,6 +1919,9 @@ static int send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid)
>   	int win;
>   
>   	skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
> +	if (!skb)
> +		return -ENOMEM;
> +
>   	req = __skb_put_zero(skb, sizeof(*req));
>   	req->op_compl = htonl(WR_OP_V(FW_OFLD_CONNECTION_WR));
>   	req->len16_pkd = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*req), 16)));