scsi: ufs: host: mediatek: Fix invalid access in vccqx handling

[ Upstream commit 5863638598f5e4f64d2f85b03f376383ca1f2ab7 ]

Add a NULL check before accessing the 'vccqx' pointer to prevent invalid
memory access. This ensures that the function safely handles cases where
'vccq' and 'vccq2' are not initialized, improving the robustness of the
power management code.

Signed-off-by: Alice Chao <alice.chao@mediatek.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20250811131423.3444014-11-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index c0106fb3792d41399ada656e64e8294ff69c340f..2be74662f960b164f2fc0fb356625f1cb2143442 100644 (file)
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1426,6 +1426,9 @@ static void ufs_mtk_vccqx_set_lpm(struct ufs_hba *hba, bool lpm)
 {
        struct ufs_vreg *vccqx = NULL;
 
+       if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2)
+               return;
+
        if (hba->vreg_info.vccq)
                vccqx = hba->vreg_info.vccq;
        else