[PATCH 4.4 012/158] media: vpss: fix a potential NULL pointer dereference

[Greg Kroah-Hartman]

[ Upstream commit e08f0761234def47961d3252eac09ccedfe4c6a0 ]

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

Signed-off-by: Kangjie Lu <k...@umn.edu>
Acked-by: Lad, Prabhakar <prabhakar.cse...@gmail.com>
Reviewed-by: Mukesh Ojha <mo...@codeaurora.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.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 fce86f17dffc..c2c68988e38a 100644
--- a/drivers/media/platform/davinci/vpss.c
+++ b/drivers/media/platform/davinci/vpss.c
@@ -523,6 +523,11 @@ 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