Re: [PATCH] ath11k: modify null check logic in ath11k_ce_rx_post_pipe()

[Baochen Qiang <baochen.qiang@oss.qualcomm.com>]

On 9/9/2024 11:08 PM, Mikhail Lobanov wrote:
> The previous logic in ath11k_ce_rx_post_pipe() incorrectly required both 
> dest_ring and status_ring to be NULL in order to exit the function. 
> This caused the function to continue even if only one of the pointers 
> was NULL, potentially leading to null pointer dereferences in 
> ath11k_ce_rx_buf_enqueue_pipe().
> 
> Fix the condition by modifying the logic so that the function returns 
> early if either dest_ring or status_ring is NULL.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
> Signed-off-by: Mikhail Lobanov <m.lobanov@rosalinux.ru>
> ---
>  drivers/net/wireless/ath/ath11k/ce.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/ce.c b/drivers/net/wireless/ath/ath11k/ce.c
> index e66e86bdec20..9d4246d65d68 100644
> --- a/drivers/net/wireless/ath/ath11k/ce.c
> +++ b/drivers/net/wireless/ath/ath11k/ce.c
> @@ -324,7 +324,7 @@ static int ath11k_ce_rx_post_pipe(struct ath11k_ce_pipe *pipe)
>  	dma_addr_t paddr;
>  	int ret = 0;
>  
> -	if (!(pipe->dest_ring || pipe->status_ring))
> +	if (!pipe->dest_ring || !pipe->status_ring)
>  		return 0;
>  
>  	spin_lock_bh(&ab->ce.ce_lock);

Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>