summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJaegeuk Kim <jaegeuk@kernel.org>2021-01-11 01:59:27 -0800
committerMartin K. Petersen <martin.petersen@oracle.com>2021-01-13 00:27:46 -0500
commita2fca52ee640a04112ed9d9a137c940ea6ad288e (patch)
tree4903820f56760fd3237aed02a09309ef25415934
parentdc0d9b12b8a74f5435097ebc7aafca76ba9cda7a (diff)
scsi: ufs: WB is only available on LUN #0 to #7
Kernel stack violation when getting unit_descriptor/wb_buf_alloc_units from rpmb LUN. The reason is that the unit descriptor length is different per LU. The length of Normal LU is 45 while the one of rpmb LU is 35. int ufshcd_read_desc_param(struct ufs_hba *hba, ...) { param_offset=41; param_size=4; buff_len=45; ... buff_len=35 by rpmb LU; if (is_kmalloc) { /* Make sure we don't copy more data than available */ if (param_offset + param_size > buff_len) param_size = buff_len - param_offset; --> param_size = 250; memcpy(param_read_buf, &desc_buf[param_offset], param_size); --> memcpy(param_read_buf, desc_buf+41, 250); [ 141.868974][ T9174] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: wb_buf_alloc_units_show+0x11c/0x11c } } Link: https://lore.kernel.org/r/20210111095927.1830311-1-jaegeuk@kernel.org Reviewed-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/scsi/ufs/ufs-sysfs.c3
-rw-r--r--drivers/scsi/ufs/ufs.h6
-rw-r--r--drivers/scsi/ufs/ufshcd.c2
3 files changed, 7 insertions, 4 deletions
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index 0e1438485133..8921700f4f72 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -792,7 +792,8 @@ static ssize_t _pname##_show(struct device *dev, \
struct scsi_device *sdev = to_scsi_device(dev); \
struct ufs_hba *hba = shost_priv(sdev->host); \
u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun); \
- if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun)) \
+ if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun, \
+ _duname##_DESC_PARAM##_puname)) \
return -EINVAL; \
return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname, \
lun, _duname##_DESC_PARAM##_puname, buf, _size); \
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 50f46f3bc8a2..09c7cc8a678d 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -569,13 +569,15 @@ enum ufs_trace_tsf_t {
* @return: true if the lun has a matching unit descriptor, false otherwise
*/
static inline bool ufs_is_valid_unit_desc_lun(struct ufs_dev_info *dev_info,
- u8 lun)
+ u8 lun, u8 param_offset)
{
if (!dev_info || !dev_info->max_lu_supported) {
pr_err("Max General LU supported by UFS isn't initialized\n");
return false;
}
-
+ /* WB is available only for the logical unit from 0 to 7 */
+ if (param_offset == UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS)
+ return lun < UFS_UPIU_MAX_WB_LUN_ID;
return lun == UFS_UPIU_RPMB_WLUN || (lun < dev_info->max_lu_supported);
}
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 5c5edb737c00..cc8d00343b9e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3439,7 +3439,7 @@ static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
* Unit descriptors are only available for general purpose LUs (LUN id
* from 0 to 7) and RPMB Well known LU.
*/
- if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun))
+ if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun, param_offset))
return -EOPNOTSUPP;
return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,