9p: fix endian issues [attempt 3]

When the changes were done to the protocol last release, some endian
bugs crept in.  This patch fixes those endian problems and has been
verified to run on 32/64 bit and x86/ppc architectures.

This version of the patch incorporates the correct annotations
for endian variables.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index dcd7666824ba57708df3fa9e9f4a8d6893539712..fc70147c771e15c2542a92e7286560f7faa1b98a 100644 (file)
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -29,6 +29,7 @@
 #include <linux/errno.h>
 #include <linux/uaccess.h>
 #include <linux/sched.h>
+#include <linux/types.h>
 #include <net/9p/9p.h>
 #include <net/9p/client.h>
 #include "protocol.h"
@@ -160,29 +161,32 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                        break;
                case 'w':{
                                int16_t *val = va_arg(ap, int16_t *);
-                               if (pdu_read(pdu, val, sizeof(*val))) {
+                               __le16 le_val;
+                               if (pdu_read(pdu, &le_val, sizeof(le_val))) {
                                        errcode = -EFAULT;
                                        break;
                                }
-                               *val = cpu_to_le16(*val);
+                               *val = le16_to_cpu(le_val);
                        }
                        break;
                case 'd':{
                                int32_t *val = va_arg(ap, int32_t *);
-                               if (pdu_read(pdu, val, sizeof(*val))) {
+                               __le32 le_val;
+                               if (pdu_read(pdu, &le_val, sizeof(le_val))) {
                                        errcode = -EFAULT;
                                        break;
                                }
-                               *val = cpu_to_le32(*val);
+                               *val = le32_to_cpu(le_val);
                        }
                        break;
                case 'q':{
                                int64_t *val = va_arg(ap, int64_t *);
-                               if (pdu_read(pdu, val, sizeof(*val))) {
+                               __le64 le_val;
+                               if (pdu_read(pdu, &le_val, sizeof(le_val))) {
                                        errcode = -EFAULT;
                                        break;
                                }
-                               *val = cpu_to_le64(*val);
+                               *val = le64_to_cpu(le_val);
                        }
                        break;
                case 's':{
@@ -362,19 +366,19 @@ p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                        }
                        break;
                case 'w':{
-                               int16_t val = va_arg(ap, int);
+                               __le16 val = cpu_to_le16(va_arg(ap, int));
                                if (pdu_write(pdu, &val, sizeof(val)))
                                        errcode = -EFAULT;
                        }
                        break;
                case 'd':{
-                               int32_t val = va_arg(ap, int32_t);
+                               __le32 val = cpu_to_le32(va_arg(ap, int32_t));
                                if (pdu_write(pdu, &val, sizeof(val)))
                                        errcode = -EFAULT;
                        }
                        break;
                case 'q':{
-                               int64_t val = va_arg(ap, int64_t);
+                               __le64 val = cpu_to_le64(va_arg(ap, int64_t));
                                if (pdu_write(pdu, &val, sizeof(val)))
                                        errcode = -EFAULT;
                        }