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SubjectRe: [PATCH] ufs: qcom: Properly clear hba priv on failure
On 2016-11-19 22:15, Bjorn Andersson wrote:
> On Sat 19 Nov 12:30 PST 2016, Subhash Jadavani wrote:
>
>> On 2016-11-18 12:55, Bjorn Andersson wrote:
>> >In the case where we fail to acquire the phy the hba priv will be set
>> >already, so during cleanup ufs_qcom_setup_clocks() will dereference the
>> >now free, but still "valid looking" pointer "host".
>>
>> host (ufs_qcom_host) was allocated with devm_kzalloc() so i am not
>> sure why
>> it would be freed up before probe() returns failure.
>>
>
> Sorry, I missed the fact that the devm_kfree() was dropped, the actual
> problem still remains, although it no longer results in a panic.

Agreed.

>
> As ufs_qcom_init() returns from not having found the phy it the variant
> data will be a zero-initialized object. The error path of
> ufshcd_hba_init() will then take us through ufs_qcom_setup_clocks(),
> which will pass the check for a NULL variant data and use the
> uninitialized host object.

Yes, Make sense.

>
> I can update the commit message to reflect the new state of things.

Your new patch set looks good, will add my ack.

>
> Regards,
> Bjorn
>
>> >Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>> >---
>> > drivers/scsi/ufs/ufs-qcom.c | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> >diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> >index d345434b084f..7bd88ffee47a 100644
>> >--- a/drivers/scsi/ufs/ufs-qcom.c
>> >+++ b/drivers/scsi/ufs/ufs-qcom.c
>> >@@ -1197,7 +1197,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>> > if (IS_ERR(host->generic_phy)) {
>> > err = PTR_ERR(host->generic_phy);
>> > dev_err(dev, "%s: PHY get failed %d\n", __func__, err);
>> >- goto out;
>> >+ goto out_host_free;
>> > }
>> >
>> > err = ufs_qcom_bus_register(host);
>>
>> --
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project
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--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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