linux-kernel - [PATCH] ath11k: mhi: fix potential memory leak in ath11k_mhi

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Message-Id: <20220526100227.483609-1-niejianglei2021@163.com>
Date:   Thu, 26 May 2022 18:02:27 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com
Cc:     ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] ath11k: mhi: fix potential memory leak in ath11k_mhi_register()

mhi_alloc_controller() allocates a memory space for mhi_ctrl. When some
errors occur, mhi_ctrl should be freed by mhi_free_controller(). But
when ath11k_mhi_read_addr_from_dt() fails, the function returns without
calling mhi_free_controller(), which will lead to a memory leak.

We can fix it by calling mhi_free_controller() when
ath11k_mhi_read_addr_from_dt() fails.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/net/wireless/ath/ath11k/mhi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index fc3524e83e52..3318c7c2b32b 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -376,8 +376,10 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
 
 	if (test_bit(ATH11K_FLAG_FIXED_MEM_RGN, &ab->dev_flags)) {
 		ret = ath11k_mhi_read_addr_from_dt(mhi_ctrl);
-		if (ret < 0)
+		if (ret < 0) {
+			mhi_free_controller(mhi_ctrl);
 			return ret;
+		}
 	} else {
 		mhi_ctrl->iova_start = 0;
 		mhi_ctrl->iova_stop = 0xFFFFFFFF;
-- 
2.25.1