From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iPigi-0005FU-4R for ath11k@lists.infradead.org; Wed, 30 Oct 2019 07:46:41 +0000 From: Karthikeyan Periyasamy Subject: [PATCH] ath11k: avoid use_after_free in ath11k_dp_rx_msdu_coalesce API Date: Wed, 30 Oct 2019 13:16:15 +0530 Message-Id: <1572421575-2904-1-git-send-email-periyasa@codeaurora.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath11k" Errors-To: ath11k-bounces+kvalo=adurom.com@lists.infradead.org To: ath11k@lists.infradead.org Cc: Karthikeyan Periyasamy Accessing already stored first msdu data after the skb expand trigger use_after_free, since first msdu got deleted. so do the descriptor copy operation before the skb expand operation. Signed-off-by: Karthikeyan Periyasamy --- drivers/net/wireless/ath/ath11k/dp_rx.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index acad746..475988b 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -1374,6 +1374,11 @@ static int ath11k_dp_rx_msdu_coalesce(struct ath11k *ar, skb_put(first, DP_RX_BUFFER_SIZE); skb_pull(first, buf_first_hdr_len); + /* When an MSDU spread over multiple buffers attention, MSDU_END and + * MPDU_END tlvs are valid only in the last buffer. Copy those tlvs. + */ + ath11k_dp_rx_desc_end_tlv_copy(rxcb->rx_desc, ldesc); + space_extra = msdu_len - (buf_first_len + skb_tailroom(first)); if (space_extra > 0 && (pskb_expand_head(first, 0, space_extra, GFP_ATOMIC) < 0)) { @@ -1389,11 +1394,6 @@ static int ath11k_dp_rx_msdu_coalesce(struct ath11k *ar, return -ENOMEM; } - /* When an MSDU spread over multiple buffers attention, MSDU_END and - * MPDU_END tlvs are valid only in the last buffer. Copy those tlvs. - */ - ath11k_dp_rx_desc_end_tlv_copy(rxcb->rx_desc, ldesc); - rem_len = msdu_len - buf_first_len; while ((skb = __skb_dequeue(msdu_list)) != NULL && rem_len > 0) { rxcb = ATH11K_SKB_RXCB(skb); -- 1.9.1 _______________________________________________ ath11k mailing list ath11k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath11k