linux-kernel - [PATCH] mmc: dw_mmc: Fix potential null pointer risk

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Date:   Wed, 29 Dec 2021 10:38:14 +0800
From:   Wen Zhiwei <wenzhiwei@...inos.cn>
To:     jh80.chung@...sung.com, ulf.hansson@...aro.org,
        p.zabel@...gutronix.de, wenzhiwei@...inos.cn
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: dw_mmc: Fix potential null pointer risk

we previously assumed 'host->slot' could be null,
null pointer judgment should be added

Signed-off-by: Wen Zhiwei <wenzhiwei@...inos.cn>
---
 drivers/mmc/host/dw_mmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index d977f34f6b55..c9dc8c168efb 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -3518,7 +3518,7 @@ int dw_mci_runtime_resume(struct device *dev)
 	mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE);
 
 
-	if (host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
+	if (host->slot && host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER)
 		dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios);
 
 	/* Force setup bus to guarantee available clock output */
-- 
2.30.0