The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7c7cfdcf7f1777c7376fc9a239980de04b6b5ea1 Mon Sep 17 00:00:00 2001

From: Adrian Hunter adrian.hunter@intel.com Date: Wed, 14 Aug 2019 15:59:50 +0300 Subject: [PATCH] scsi: ufs: Fix NULL pointer dereference in ufshcd_config_vreg_hpm()

Fix the following BUG:

[ 187.065689] BUG: kernel NULL pointer dereference, address: 000000000000001c [ 187.065790] RIP: 0010:ufshcd_vreg_set_hpm+0x3c/0x110 [ufshcd_core] [ 187.065938] Call Trace: [ 187.065959] ufshcd_resume+0x72/0x290 [ufshcd_core] [ 187.065980] ufshcd_system_resume+0x54/0x140 [ufshcd_core] [ 187.065993] ? pci_pm_restore+0xb0/0xb0 [ 187.066005] ufshcd_pci_resume+0x15/0x20 [ufshcd_pci] [ 187.066017] pci_pm_thaw+0x4c/0x90 [ 187.066030] dpm_run_callback+0x5b/0x150 [ 187.066043] device_resume+0x11b/0x220

Voltage regulators are optional, so functions must check they exist before dereferencing.

Note this issue is hidden if CONFIG_REGULATORS is not set, because the offending code is optimised away.

Notes for stable:

The issue first appears in commit 57d104c153d3 ("ufs: add UFS power management support") but is inadvertently fixed in commit 60f0187031c0 ("scsi: ufs: disable vccq if it's not needed by UFS device") which in turn was reverted by commit 730679817d83 ("Revert "scsi: ufs: disable vccq if it's not needed by UFS device""). So fix applies v3.18 to v4.5 and v5.1+

Fixes: 57d104c153d3 ("ufs: add UFS power management support") Fixes: 730679817d83 ("Revert "scsi: ufs: disable vccq if it's not needed by UFS device"") Cc: stable@vger.kernel.org Signed-off-by: Adrian Hunter adrian.hunter@intel.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index e274053109d0..029da74bb2f5 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -7062,6 +7062,9 @@ static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba, 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); }