[lkml]   [2019]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
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

Signed-off-by: Adrian Hunter <>
Fixes: 57d104c153d3 ("ufs: add UFS power management support")
Fixes: 730679817d83 ("Revert "scsi: ufs: disable vccq if it's not needed by UFS device"")
drivers/scsi/ufs/ufshcd.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 507fd51e8039..219c435d69a7 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7105,6 +7105,9 @@ 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);

 \ /
  Last update: 2019-08-14 15:02    [W:0.027 / U:134.032 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site