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scsi: ufs: fix bugs related to null pointer access and array size 

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>
This commit is contained in:
Yaniv Gardi 2016-10-17 17:09:24 -07:00 committed by Martin K. Petersen
parent 8d9c1f86a3
commit e3ce73d69a
2 changed files with 21 additions and 7 deletions
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3
drivers/scsi/ufs/ufs.h
View File

@ -46,6 +46,7 @@
#define QUERY_DESC_HDR_SIZE 2 #define QUERY_DESC_HDR_SIZE 2
#define QUERY_OSF_SIZE (GENERAL_UPIU_REQUEST_SIZE - \ #define QUERY_OSF_SIZE (GENERAL_UPIU_REQUEST_SIZE - \
(sizeof(struct utp_upiu_header))) (sizeof(struct utp_upiu_header)))
#define RESPONSE_UPIU_SENSE_DATA_LENGTH 18
#define UPIU_HEADER_DWORD(byte3, byte2, byte1, byte0)\ #define UPIU_HEADER_DWORD(byte3, byte2, byte1, byte0)\
cpu_to_be32((byte3 << 24) | (byte2 << 16) |\ cpu_to_be32((byte3 << 24) | (byte2 << 16) |\
@ -416,7 +417,7 @@ struct utp_cmd_rsp {
__be32 residual_transfer_count; __be32 residual_transfer_count;
__be32 reserved[4]; __be32 reserved[4];
__be16 sense_data_len; __be16 sense_data_len;
u8 sense_data[18]; u8 sense_data[RESPONSE_UPIU_SENSE_DATA_LENGTH];
}; };
/** /**

25
drivers/scsi/ufs/ufshcd.c
View File

@ -889,10 +889,14 @@ static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
int len; int len;
if (lrbp->sense_buffer && if (lrbp->sense_buffer &&
ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) { 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 = 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, memcpy(lrbp->sense_buffer,
lrbp->ucd_rsp_ptr->sr.sense_data, lrbp->ucd_rsp_ptr->sr.sense_data,
min_t(int, len, SCSI_SENSE_BUFFERSIZE)); min_t(int, len_to_copy, SCSI_SENSE_BUFFERSIZE));
} }
} }
@ -6091,7 +6095,10 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
int ufshcd_system_resume(struct ufs_hba *hba) 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 * Let the runtime resume take care of resuming
* if runtime suspended. * if runtime suspended.
@ -6112,7 +6119,10 @@ EXPORT_SYMBOL(ufshcd_system_resume);
*/ */
int ufshcd_runtime_suspend(struct ufs_hba *hba) int ufshcd_runtime_suspend(struct ufs_hba *hba)
{ {
if (!hba || !hba->is_powered) if (!hba)
return -EINVAL;
if (!hba->is_powered)
return 0; return 0;
return ufshcd_suspend(hba, UFS_RUNTIME_PM); return ufshcd_suspend(hba, UFS_RUNTIME_PM);
@ -6142,10 +6152,13 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
*/ */
int ufshcd_runtime_resume(struct ufs_hba *hba) int ufshcd_runtime_resume(struct ufs_hba *hba)
{ {
if (!hba || !hba->is_powered) if (!hba)
return -EINVAL;
if (!hba->is_powered)
return 0; return 0;
else
return ufshcd_resume(hba, UFS_RUNTIME_PM); return ufshcd_resume(hba, UFS_RUNTIME_PM);
} }
EXPORT_SYMBOL(ufshcd_runtime_resume); EXPORT_SYMBOL(ufshcd_runtime_resume);