Commit d2f510fa authored by Sriram R's avatar Sriram R Committed by Kalle Valo
Browse files

ath11k: Fix skb_panic observed during msdu coalescing 



skb_panic is hit during msdu coalescing whenever
enough tailroom is not allocated based on the remaining
msdu length which is spread across in different rx buffers.

Compute the extra length for resizing the skb based on
the total msdu length and the msdu length of the first buffer.

Signed-off-by: default avatarSriram R <srirrama@codeaurora.org>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent d12ac6c4

drivers/net/wireless/ath/ath11k/dp_rx.c

+14 −8
Original line number Diff line number Diff line
@@ -1344,15 +1344,22 @@ static int ath11k_dp_rx_msdu_coalesce(struct ath11k *ar, 
{

	struct sk_buff *skb;

	struct ath11k_skb_rxcb *rxcb = ATH11K_SKB_RXCB(first);

	int buf_first_hdr_len, buf_first_len;

	struct hal_rx_desc *ldesc;

	int space_extra;

	int rem_len;

	int buf_len;



	if (WARN_ON_ONCE(msdu_len <= (DP_RX_BUFFER_SIZE -

			 (HAL_RX_DESC_SIZE + l3pad_bytes)))) {

		skb_put(first, HAL_RX_DESC_SIZE + l3pad_bytes + msdu_len);

		skb_pull(first, HAL_RX_DESC_SIZE + l3pad_bytes);

	/* As the msdu is spread across multiple rx buffers,

	 * find the offset to the start of msdu for computing

	 * the length of the msdu in the first buffer.

	 */

	buf_first_hdr_len = HAL_RX_DESC_SIZE + l3pad_bytes;

	buf_first_len = DP_RX_BUFFER_SIZE - buf_first_hdr_len;



	if (WARN_ON_ONCE(msdu_len <= buf_first_len)) {

		skb_put(first, buf_first_hdr_len + msdu_len);

		skb_pull(first, buf_first_hdr_len);

		return 0;

	}
@@ -1365,9 +1372,9 @@ static int ath11k_dp_rx_msdu_coalesce(struct ath11k *ar, 
	 * in the first buf is of length DP_RX_BUFFER_SIZE - HAL_RX_DESC_SIZE.

	 */

	skb_put(first, DP_RX_BUFFER_SIZE);

	skb_pull(first, HAL_RX_DESC_SIZE + l3pad_bytes);

	skb_pull(first, buf_first_hdr_len);



	space_extra = msdu_len - (DP_RX_BUFFER_SIZE + skb_tailroom(first));

	space_extra = msdu_len - (buf_first_len + skb_tailroom(first));

	if (space_extra > 0 &&

	    (pskb_expand_head(first, 0, space_extra, GFP_ATOMIC) < 0)) {

		/* Free up all buffers of the MSDU */
@@ -1387,8 +1394,7 @@ static int ath11k_dp_rx_msdu_coalesce(struct ath11k *ar, 
	 */

	ath11k_dp_rx_desc_end_tlv_copy(rxcb->rx_desc, ldesc);



	rem_len = msdu_len -

		  (DP_RX_BUFFER_SIZE - HAL_RX_DESC_SIZE - l3pad_bytes);

	rem_len = msdu_len - buf_first_len;

	while ((skb = __skb_dequeue(msdu_list)) != NULL && rem_len > 0) {

		rxcb = ATH11K_SKB_RXCB(skb);

		if (rxcb->is_continuation)

CRA Git | Maintained and supported by SUSTech CRA and CCSE