linux-kernel - [PATCH v4] wifi: ath11k: Fix NULL pointer check in ath11k_ce_rx_post

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Message-Id: <20241127114310.26085-1-zghbqbc@gmail.com>
Date: Wed, 27 Nov 2024 19:43:10 +0800
From: Baichuan Qi <zghbqbc@...il.com>
To: markus.elfring@....de
Cc: ath11k@...ts.infradead.org,
	jjohnson@...nel.org,
	kvalo@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	zghbqbc@...il.com
Subject: [PATCH v4] wifi: ath11k: Fix NULL pointer check in ath11k_ce_rx_post_pipe()

Current implementation of `ath11k_ce_rx_post_pipe()` checks for
NON-NULL of either `dest_ring` or `status_ring` using an OR (||).
Both rings, especially `dest_ring`, should be ensured to be
NON-NULL in this function.

If only one of the rings is valid, such as `dest_ring` is NULL
and `status_ring` is NON-NULL, the OR (||) check would not stop
`ath11k_ce_rx_post_pipe()`, the subsequent call to
`ath11k_ce_rx_buf_enqueue_pipe()` will access the NULL pointer,
resulting in a driver crash.

Fix the NON-NULL check by changing the OR (||) to AND (&&),
ensuring that the function only proceeds when both `dest_ring`
and `status_ring` are NON-NULL.

Link: https://lore.kernel.org/ath11k/a9ccc947-20b2-4322-84e5-c96aaa604e63@web.de
Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Baichuan Qi <zghbqbc@...il.com>
---
V3 -> V4: reorder describe info
V2 -> V3: add Link URL to mailing list archives
V1 -> V2: rewrite commit message and fix tag

 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..cc9ad014d800 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);
-- 
2.34.1