linux-kernel - [PATCH V1] mmc: sdhci: Fix potential null pointer access while accessing vqmmc

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Date:   Thu,  9 Jul 2020 18:43:25 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        dan.carpenter@...cle.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Vijay Viswanath <vviswana@...eaurora.org>
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 <dan.carpenter@...cle.com>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
---
 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) {
-- 
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