2020-07-09 13:14:29

by Veerabhadrarao Badiganti

Subject: [PATCH V1] mmc: sdhci: Fix potential null pointer access while accessing vqmmc

Don't access vqmmc regulator handler, if it's already invalidated.

Fixes: f870b6d480d3 (mmc: sdhci: Allow platform controlled voltage switching)
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Veerabhadrarao Badiganti <[email protected]>
---
drivers/mmc/host/sdhci.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index e6275c2202b0..d3b62fc5c661 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -4383,11 +4383,6 @@ int sdhci_setup_host(struct sdhci_host *host)
if (!IS_ERR(mmc->supply.vqmmc)) {
if (enable_vqmmc) {
ret = regulator_enable(mmc->supply.vqmmc);
- if (ret) {
- pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
- mmc_hostname(mmc), ret);
- mmc->supply.vqmmc = ERR_PTR(-EINVAL);
- }
host->sdhci_core_to_disable_vqmmc = !ret;
}

@@ -4402,6 +4397,13 @@ int sdhci_setup_host(struct sdhci_host *host)
if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
3600000))
host->flags &= ~SDHCI_SIGNALING_330;
+
+ if (ret) {
+ pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+ mmc_hostname(mmc), ret);
+ mmc->supply.vqmmc = ERR_PTR(-EINVAL);
+ }
+
}

if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

2020-07-10 08:01:28

by Ulf Hansson

Subject: Re: [PATCH V1] mmc: sdhci: Fix potential null pointer access while accessing vqmmc

On Thu, 9 Jul 2020 at 15:13, Veerabhadrarao Badiganti
<[email protected]> wrote:
>
> Don't access vqmmc regulator handler, if it's already invalidated.
>
> Fixes: f870b6d480d3 (mmc: sdhci: Allow platform controlled voltage switching)
> Reported-by: Dan Carpenter <[email protected]>
> Signed-off-by: Veerabhadrarao Badiganti <[email protected]>

Applied for next, thanks!

Kind regards
Uffe

> ---
> drivers/mmc/host/sdhci.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index e6275c2202b0..d3b62fc5c661 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -4383,11 +4383,6 @@ int sdhci_setup_host(struct sdhci_host *host)
> if (!IS_ERR(mmc->supply.vqmmc)) {
> if (enable_vqmmc) {
> ret = regulator_enable(mmc->supply.vqmmc);
> - if (ret) {
> - pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> - mmc_hostname(mmc), ret);
> - mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> - }
> host->sdhci_core_to_disable_vqmmc = !ret;
> }
>
> @@ -4402,6 +4397,13 @@ int sdhci_setup_host(struct sdhci_host *host)
> if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
> 3600000))
> host->flags &= ~SDHCI_SIGNALING_330;
> +
> + if (ret) {
> + pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
> + mmc_hostname(mmc), ret);
> + mmc->supply.vqmmc = ERR_PTR(-EINVAL);
> + }
> +
> }
>
> if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
> --
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>