linux-kernel - [PATCH] media: m5mols: Check function pointer in m5mols_sensor

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Message-Id: <20200719153447.4380-1-trix@redhat.com>
Date:   Sun, 19 Jul 2020 08:34:47 -0700
From:   trix@...hat.com
To:     kyungmin.park@...sung.com, riverful.kim@...sung.com,
        mchehab@...nel.org, s.nawrocki@...sung.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] media: m5mols: Check function pointer in m5mols_sensor_power

From: Tom Rix <trix@...hat.com>

clang static analysis reports this error

m5mols_core.c:767:4: warning: Called function pointer
  is null (null dereference) [core.CallAndMessage]
    info->set_power(&client->dev, 0);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In other places, the set_power ptr is checked.
So add a check.

Fixes: bc125106f8af ("[media] Add support for M-5MOLS 8 Mega Pixel camera ISP")

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/media/i2c/m5mols/m5mols_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/m5mols/m5mols_core.c b/drivers/media/i2c/m5mols/m5mols_core.c
index de295114ca48..21666d705e37 100644
--- a/drivers/media/i2c/m5mols/m5mols_core.c
+++ b/drivers/media/i2c/m5mols/m5mols_core.c
@@ -764,7 +764,8 @@ static int m5mols_sensor_power(struct m5mols_info *info, bool enable)
 
 		ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
 		if (ret) {
-			info->set_power(&client->dev, 0);
+			if (info->set_power)
+				info->set_power(&client->dev, 0);
 			return ret;
 		}
 
-- 
2.18.1