Re: [PATCH] ath11k: mhi: fix potential memory leak in ath11k_mhi_register()
From: Jeff Johnson <hidden>
Date: 2022-09-07 20:10:40
Also in:
ath11k, linux-wireless, lkml
On 9/7/2022 12:37 AM, Jianglei Nie wrote:
mhi_alloc_controller() allocates a memory space for mhi_ctrl. When gets some error, mhi_ctrl should be freed with 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 <redacted>
I believe this should have been annotated as -v2 to the following: <https://lore.kernel.org/ath11k/20220526100227.483609-1-niejianglei2021@163.com/ (local)> Please properly annotate follow-up patches. Also please add wifi: to the beginning of the subject prefix
quoted hunk ↗ jump to hunk
--- 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 c44df17719f6..86995e8dc913 100644 --- a/drivers/net/wireless/ath/ath11k/mhi.c +++ b/drivers/net/wireless/ath/ath11k/mhi.c@@ -402,8 +402,7 @@ 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_FLAG_MULTI_MSI_VECTORS, &ab->dev_flags))@@ -412,7 +411,7 @@ 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;@@ -440,18 +439,22 @@ 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)
Reviewed-by: Jeff Johnson <redacted>