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scsi: ufs: ufshcd: fix potential NULL pointer dereference in ufshcd_config_vreg

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[ 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: aa49761309 ("ufs: Add regulator enable support")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2017-11-20 08:12:29 -06:00 committed by Greg Kroah-Hartman
parent 03c2854d14
commit d8933268bd
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/ufs/ufshcd.c
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@ -4392,12 +4392,15 @@ 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);