wifi: ath12k: mhi: fix potential memory leak in ath12k_mhi_register()

[ Upstream commit 47c27aa7ded4b8ead19b3487cc42a6185b762903 ]

mhi_alloc_controller() allocates a memory space for mhi_ctrl. When some
errors occur, mhi_ctrl should be freed by mhi_free_controller() and set
ab_pci->mhi_ctrl = NULL.

We can fix it by calling mhi_free_controller() when the failure happens
and set ab_pci->mhi_ctrl = NULL in all of the places where we call
mhi_free_controller().

Signed-off-by: Ma Ke <make_ruc2021@163.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230922021036.3604157-1-make_ruc2021@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/ath12k/mhi.c b/drivers/net/wireless/ath/ath12k/mhi.c
index 42f1140..f83d3e0 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/mhi.c
+++ b/drivers/net/wireless/ath/ath12k/mhi.c
@@ -370,8 +370,7 @@ int ath12k_mhi_register(struct ath12k_pci *ab_pci)
        ret = ath12k_mhi_get_msi(ab_pci);
        if (ret) {
                ath12k_err(ab, "failed to get msi for mhi\n");
-               mhi_free_controller(mhi_ctrl);
-               return ret;
+               goto free_controller;
        }
 
        mhi_ctrl->iova_start = 0;
@@ -388,11 +387,15 @@ int ath12k_mhi_register(struct ath12k_pci *ab_pci)
        ret = mhi_register_controller(mhi_ctrl, ab->hw_params->mhi_config);
        if (ret) {
                ath12k_err(ab, "failed to register to mhi bus, err = %d\n", ret);
-               mhi_free_controller(mhi_ctrl);
-               return ret;
+               goto free_controller;
        }
 
        return 0;
+
+free_controller:
+       mhi_free_controller(mhi_ctrl);
+       ab_pci->mhi_ctrl = NULL;
+       return ret;
 }
 
 void ath12k_mhi_unregister(struct ath12k_pci *ab_pci)