[PATCH ath-next] wifi: ath12k: fix invalid access to memory

[Sarika Sharma]

In ath12k_dp_rx_msdu_coalesce(), rxcb is fetched from skb and boolean
is_continuation is part of rxcb.
Currently, after freeing the skb, the rxcb->is_continuation accessed
again which is wrong since the memory is already freed.
This might lead use-after-free error.

Hence, fix by locally defining bool is_continuation from rxcb,
so that after freeing skb, is_continuation can be used.

Compile tested only.

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Sarika Sharma <quic_sarishar at quicinc.com>
---
 drivers/net/wireless/ath/ath12k/dp_rx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c
index 48d907a400b3..f0f9d05443b9 100644
--- a/drivers/net/wireless/ath/ath12k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath12k/dp_rx.c
@@ -1824,6 +1824,7 @@ static int ath12k_dp_rx_msdu_coalesce(struct ath12k *ar,
 	struct hal_rx_desc *ldesc;
 	int space_extra, rem_len, buf_len;
 	u32 hal_rx_desc_sz = ar->ab->hal.hal_desc_sz;
+	bool is_continuation;
 
 	/* As the msdu is spread across multiple rx buffers,
 	 * find the offset to the start of msdu for computing
@@ -1872,7 +1873,8 @@ static int ath12k_dp_rx_msdu_coalesce(struct ath12k *ar,
 	rem_len = msdu_len - buf_first_len;
 	while ((skb = __skb_dequeue(msdu_list)) != NULL && rem_len > 0) {
 		rxcb = ATH12K_SKB_RXCB(skb);
-		if (rxcb->is_continuation)
+		is_continuation = rxcb->is_continuation;
+		if (is_continuation)
 			buf_len = DP_RX_BUFFER_SIZE - hal_rx_desc_sz;
 		else
 			buf_len = rem_len;
@@ -1890,7 +1892,7 @@ static int ath12k_dp_rx_msdu_coalesce(struct ath12k *ar,
 		dev_kfree_skb_any(skb);
 
 		rem_len -= buf_len;
-		if (!rxcb->is_continuation)
+		if (!is_continuation)
 			break;
 	}
 

base-commit: 12b93f7c6d101d22e0ea3bf4a240699746c79117
-- 
2.34.1