[ldv-project] [PATCH] cxgb4i : Added pointer check

Tue Nov 15 20:30:03 MSK 2022

On 11/15/22 3:46 AM, Denis Arefev wrote:
> Return value of a function 'alloc_wr' is dereferenced at cxgb4i.c:624
> without checking for null, but it is usually checked for this function
>> Signed-off-by: Denis Arefev <arefev at swemel.ru>
> ---
> drivers/scsi/cxgbi/cxgb4i/cxgb4i.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>> diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> index 2c3491528d42..40ed8e27945c 100644
> --- a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> +++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
> @@ -611,7 +611,7 @@ static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
>> static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
> {
> -	struct sk_buff *skb;
> +	struct sk_buff *skb = NULL;

You can drop this part since it's set a little lower when we do the alloc.
> 	struct fw_flowc_wr *flowc;
> 	int nparams, flowclen16, flowclen;
>> @@ -620,6 +620,8 @@ static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
> #endif
> 	flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
> 	skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
> +	if (!skb)
> +	 return -ENOMEM;

Your tabbing got messed up. Maybe you used a space where you wanted a tab.
> 	flowc = (struct fw_flowc_wr *)skb->head;
> 	flowc->op_to_nparams =
> 		htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));