[PATCH 4.4 73/86] scsi: ufs: fix bugs related to null pointer access and array size

Greg Kroah-Hartman
2018-11-29T14:19:54Z

From: Yaniv Gardi <ygardi@codeaurora.org>

commit e3ce73d69aff44421d7899b235fec5ac2c306ff4 upstream.

In this change there are a few fixes of possible NULL pointer access and
possible access to index that exceeds array boundaries.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/ufs/ufs.h | 3 ++-
drivers/scsi/ufs/ufshcd.c | 25 +++++++++++++++++++------
2 files changed, 21 insertions(+), 7 deletions(-)

--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -45,6 +45,7 @@
#define QUERY_DESC_MIN_SIZE 2
#define QUERY_OSF_SIZE (GENERAL_UPIU_REQUEST_SIZE - \
(sizeof(struct utp_upiu_header)))
+#define RESPONSE_UPIU_SENSE_DATA_LENGTH 18

#define UPIU_HEADER_DWORD(byte3, byte2, byte1, byte0)\
cpu_to_be32((byte3 << 24) | (byte2 << 16) |\
@@ -383,7 +384,7 @@ struct utp_cmd_rsp {
__be32 residual_transfer_count;
__be32 reserved[4];
__be16 sense_data_len;
- u8 sense_data[18];
+ u8 sense_data[RESPONSE_UPIU_SENSE_DATA_LENGTH];
};

/**
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -813,10 +813,14 @@ static inline void ufshcd_copy_sense_dat
int len;
if (lrbp->sense_buffer &&
ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
+ int len_to_copy;
+
len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
+ len_to_copy = min_t(int, RESPONSE_UPIU_SENSE_DATA_LENGTH, len);
+
memcpy(lrbp->sense_buffer,
lrbp->ucd_rsp_ptr->sr.sense_data,
- min_t(int, len, SCSI_SENSE_BUFFERSIZE));
+ min_t(int, len_to_copy, SCSI_SENSE_BUFFERSIZE));
}
}

@@ -5251,7 +5255,10 @@ EXPORT_SYMBOL(ufshcd_system_suspend);

int ufshcd_system_resume(struct ufs_hba *hba)
{
- if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev))
+ if (!hba)
+ return -EINVAL;
+
+ if (!hba->is_powered || pm_runtime_suspended(hba->dev))
/*
* Let the runtime resume take care of resuming
* if runtime suspended.
@@ -5272,7 +5279,10 @@ EXPORT_SYMBOL(ufshcd_system_resume);
*/
int ufshcd_runtime_suspend(struct ufs_hba *hba)
{
- if (!hba || !hba->is_powered)
+ if (!hba)
+ return -EINVAL;
+
+ if (!hba->is_powered)
return 0;

return ufshcd_suspend(hba, UFS_RUNTIME_PM);
@@ -5302,10 +5312,13 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
*/
int ufshcd_runtime_resume(struct ufs_hba *hba)
{
- if (!hba || !hba->is_powered)
+ if (!hba)
+ return -EINVAL;
+
+ if (!hba->is_powered)
return 0;
- else
- return ufshcd_resume(hba, UFS_RUNTIME_PM);
+
+ return ufshcd_resume(hba, UFS_RUNTIME_PM);
}
EXPORT_SYMBOL(ufshcd_runtime_resume);