Staging: sep: ensure that caller id buffer is little endian

Signed-off-by: Mark Allyn <mark.a.allyn@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/sep/sep_driver.c

@@ -897,6 +897,7 @@ static int sep_set_caller_id_handler(struct sep_device *sep, unsigned long arg)
 static int sep_set_current_caller_id(struct sep_device *sep)
 {
 	int i;
+	u32 *hash_buf_ptr;
 
 	dev_dbg(&sep->pdev->dev, "sep_set_current_caller_id start\n");
 	dev_dbg(&sep->pdev->dev, "current process is %d\n", current->pid);
@@ -915,6 +916,13 @@ static int sep_set_current_caller_id(struct sep_device *sep)
 			break;
 		}
 	}
+	/* Ensure data is in little endian */
+	hash_buf_ptr = (u32 *)sep->shared_addr +
+		SEP_CALLER_ID_OFFSET_BYTES;
+
+	for (i = 0; i < SEP_CALLER_ID_HASH_SIZE_IN_WORDS; i++)
+		hash_buf_ptr[i] = cpu_to_le32(hash_buf_ptr[i]);
+
 	dev_dbg(&sep->pdev->dev, "sep_set_current_caller_id end\n");
 	return 0;
 }

drivers/staging/sep/sep_driver_config.h

@@ -201,6 +201,9 @@ held by the proccess (struct file) */
 /* size of the caller id hash (sha2) */
 #define SEP_CALLER_ID_HASH_SIZE_IN_BYTES                      32
 
+/* size of the caller id hash (sha2) in 32 bit words */
+#define SEP_CALLER_ID_HASH_SIZE_IN_WORDS                8
+
 /* maximum number of entries in the caller id table */
 #define SEP_CALLER_ID_TABLE_NUM_ENTRIES                       20