scsi: ufs: ufs-mediatek: Fix invalid access to vccqx

NULL pointer access issue was found for the regulator released
by ufs_mtk_vreg_fix_vccq(). Simply fix this issue by clearing
the released vreg pointer in ufs_hba struct.

Link: https://lore.kernel.org/r/20220623035052.18802-9-stanley.chu@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Alice Chao <alice.chao@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index f81a7444f8a6885af2026e5423d202ba85aa9d8b..c958279bdd8fb4b04c4b0c0fb8e016ddca60a60d 100644 (file)
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -758,6 +758,7 @@ static void ufs_mtk_vreg_fix_vccqx(struct ufs_hba *hba)
                regulator_disable((*vreg_off)->reg);
                devm_kfree(hba->dev, (*vreg_off)->name);
                devm_kfree(hba->dev, *vreg_off);
+               *vreg_off = NULL;
        }
 }