scsi: ufs: Check Null pointer de-reference.

-Check vreg Null pointer de-reference before accessing
vreg->max_uA.

Bug 200213306

Change-Id: I23d1527ebd7c7384348be266975ee73df63bfc49
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/1171859
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkata Jagadish <vjagadish@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 0ba7dda1678d4b3889a47fca1601f0368af492b3..3cbecd54d92ba68702ea3f29f517536079f8b2c2 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4385,12 +4385,16 @@ static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
 static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
                                         struct ufs_vreg *vreg)
 {
+       if (!vreg)
+               return 0;
        return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
 }
 
 static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
                                         struct ufs_vreg *vreg)
 {
+       if (!vreg)
+               return 0;
        return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
 }