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wifi: ath11k: mhi: fix potential memory leak in ath11k_mhi_register() 

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 <niejianglei2021@163.com>
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220907073704.58806-1-niejianglei2021@163.com
This commit is contained in:
Jianglei Nie 2022-09-07 15:37:04 +08:00 committed by Kalle Valo
parent 876eb84882
commit 43e7c3505e
1 changed files with 10 additions and 7 deletions
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17
drivers/net/wireless/ath/ath11k/mhi.c
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@ -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)