From: Gustavo A. R. Silva Date: Mon, 20 Nov 2017 14:12:29 +0000 (-0600) Subject: scsi: ufs: ufshcd: fix potential NULL pointer dereference in ufshcd_config_vreg X-Git-Tag: archive/raspbian/4.9.80-2+rpi1~7^2~23 X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com//%22stanciumarius94%40gmail.com/%22/%22http:/www.example.com/%22stanciumarius94%40gmail.com/%22?a=commitdiff_plain;h=a248dc6a55b782ec8a86e3a7ee2750e60f428c45;p=linux-4.9.git scsi: ufs: ufshcd: fix potential NULL pointer dereference in ufshcd_config_vreg [ Upstream commit 727535903bea924c4f73abb202c4b3e85fff0ca4 ] _vreg_ is being dereferenced before it is null checked, hence there is a potential null pointer dereference. Fix this by moving the pointer dereference after _vreg_ has been null checked. This issue was detected with the help of Coccinelle. Fixes: aa4976130934 ("ufs: Add regulator enable support") Signed-off-by: Gustavo A. R. Silva Reviewed-by: Subhash Jadavani Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 530034bc2d13..2e9341233f66 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5327,12 +5327,15 @@ static int ufshcd_config_vreg(struct device *dev, struct ufs_vreg *vreg, bool on) { int ret = 0; - struct regulator *reg = vreg->reg; - const char *name = vreg->name; + struct regulator *reg; + const char *name; int min_uV, uA_load; BUG_ON(!vreg); + reg = vreg->reg; + name = vreg->name; + if (regulator_count_voltages(reg) > 0) { min_uV = on ? vreg->min_uV : 0; ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);