From mboxrd@z Thu Jan 1 00:00:00 1970 From: Emil Goode Date: Wed, 28 May 2014 13:33:50 +0000 Subject: [PATCH] mfd: fix unintentional NULL check in menelaus_set_voltage() Message-Id: <1401284030-9650-1-git-send-email-emilgoode@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Samuel Ortiz , Lee Jones , Jingoo Han Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Emil Goode The struct menelaus_vtg pointer vtg cannot be NULL here so the condition is never true and if it ever was true it would lead to a NULL pointer dereference when we goto label set_voltage. Before the below patch was applied the code was: if (vtg = 0) The intention was to check if vtg_val is 0. commit 59a9f7a32adf6537b4e4db8ca204eeb77d7a634e ("mfd: menelaus: Use NULL instead of 0") Signed-off-by: Emil Goode --- Hello, This is only build tested, it would be good to get a comment from someone who is familiar with this code. Found using coccinelle. Best regards, Emil Goode drivers/mfd/menelaus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mfd/menelaus.c b/drivers/mfd/menelaus.c index ad25bfa..4859597 100644 --- a/drivers/mfd/menelaus.c +++ b/drivers/mfd/menelaus.c @@ -466,7 +466,7 @@ static int menelaus_set_voltage(const struct menelaus_vtg *vtg, int mV, struct i2c_client *c = the_menelaus->client; mutex_lock(&the_menelaus->lock); - if (!vtg) + if (vtg_val = 0) goto set_voltage; ret = menelaus_read_reg(vtg->vtg_reg); -- 1.7.10.4