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Subject[PATCH v2] ath11k: mhi: fix potential memory leak in ath11k_mhi_register()
Date
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 because ab_pci->mhi_ctrl has a dangling pointer
to the freed memory. 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 and set ab_pci->mhi_ctrl = NULL in
all of the places where we call mhi_free_controller().

Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
---
drivers/net/wireless/ath/ath11k/mhi.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index fc3524e83e52..fc1bbf91c58e 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -367,8 +367,7 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
ret = ath11k_mhi_get_msi(ab_pci);
if (ret) {
ath11k_err(ab, "failed to get msi for mhi\n");
- mhi_free_controller(mhi_ctrl);
- return ret;
+ goto free_controller;
}

if (!test_bit(ATH11K_PCI_FLAG_MULTI_MSI_VECTORS, &ab_pci->flags))
@@ -377,7 +376,7 @@ 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)
- return ret;
+ goto free_controller;
} else {
mhi_ctrl->iova_start = 0;
mhi_ctrl->iova_stop = 0xFFFFFFFF;
@@ -405,18 +404,22 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
default:
ath11k_err(ab, "failed assign mhi_config for unknown hw rev %d\n",
ab->hw_rev);
- mhi_free_controller(mhi_ctrl);
- return -EINVAL;
+ ret = -EINVAL;
+ goto free_controller;
}

ret = mhi_register_controller(mhi_ctrl, ath11k_mhi_config);
if (ret) {
ath11k_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 ath11k_mhi_unregister(struct ath11k_pci *ab_pci)
--
2.25.1
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