linux-kernel - [PATCH 4.19 020/271] media: vpss: fix a potential NULL pointer dereference

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Message-Id: <20190724191656.970819710@linuxfoundation.org>
Date:   Wed, 24 Jul 2019 21:18:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Mukesh Ojha <mojha@...eaurora.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 020/271] media: vpss: fix a potential NULL pointer dereference

[ Upstream commit e08f0761234def47961d3252eac09ccedfe4c6a0 ]

In case ioremap fails, the fix returns -ENOMEM to avoid NULL
pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
Acked-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/davinci/vpss.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/davinci/vpss.c b/drivers/media/platform/davinci/vpss.c
index 19cf6853411e..89a86c19579b 100644
--- a/drivers/media/platform/davinci/vpss.c
+++ b/drivers/media/platform/davinci/vpss.c
@@ -518,6 +518,11 @@ static int __init vpss_init(void)
 		return -EBUSY;
 
 	oper_cfg.vpss_regs_base2 = ioremap(VPSS_CLK_CTRL, 4);
+	if (unlikely(!oper_cfg.vpss_regs_base2)) {
+		release_mem_region(VPSS_CLK_CTRL, 4);
+		return -ENOMEM;
+	}
+
 	writel(VPSS_CLK_CTRL_VENCCLKEN |
 		     VPSS_CLK_CTRL_DACCLKEN, oper_cfg.vpss_regs_base2);
 
-- 
2.20.1