linux-kernel - [PATCH] mmc: sdhci-msm: Fix possible NULL pointer exception

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Message-Id: <1608626913-16675-1-git-send-email-mdalam@codeaurora.org>
Date:   Tue, 22 Dec 2020 14:18:33 +0530
From:   Md Sadre Alam <mdalam@...eaurora.org>
To:     bjorn.andersson@...aro.org, adrian.hunter@...el.com,
        ulf.hansson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     mdalam@...eaurora.org, sricharan@...eaurora.org
Subject: [PATCH] mmc: sdhci-msm: Fix possible NULL pointer exception

of_device_get_match_data returns NULL when no match.
So add the NULL pointer check to avoid dereference.

Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 9c7927b..f20e424 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -2235,6 +2235,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	 * the data associated with the version info.
 	 */
 	var_info = of_device_get_match_data(&pdev->dev);
+	if (!var_info)
+		goto pltfm_free;
 
 	msm_host->mci_removed = var_info->mci_removed;
 	msm_host->restore_dll_config = var_info->restore_dll_config;
-- 
2.7.4