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: v3.18.94~17 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bac8214c01f7dfbb2a3de94ac20bb2366edddb2;p=thirdparty%2Fkernel%2Fstable.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 605ca60e8a10d..64ee59685aacf 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4287,12 +4287,15 @@ 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);