[PATCH v4 2/13] Correct buffer parsing in update_dt_node()

[Nathan Fontenot]

Correct parsing of the buffer returned from ibm,update-properties. The first
element is a length and the path to the property which is slightly different
from the list of properties in the buffer so we need to specifically
handle this.

Signed-off-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/mobility.c |   20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

Index: powerpc/arch/powerpc/platforms/pseries/mobility.c
===================================================================
--- powerpc.orig/arch/powerpc/platforms/pseries/mobility.c	2013-04-23 13:22:05.000000000 -0500
+++ powerpc/arch/powerpc/platforms/pseries/mobility.c	2013-04-23 13:39:36.000000000 -0500
@@ -134,6 +134,7 @@
 	char *prop_data;
 	char *rtas_buf;
 	int update_properties_token;
+	u32 vd;
 
 	update_properties_token = rtas_token("ibm,update-properties");
 	if (update_properties_token == RTAS_UNKNOWN_SERVICE)
@@ -160,13 +161,24 @@
 
 		prop_data = rtas_buf + sizeof(*upwa);
 
-		for (i = 0; i < upwa->nprops; i++) {
+		/* The first element of the buffer is the path of the node
+		 * being updated in the form of a 8 byte string length
+		 * followed by the string. Skip past this to get to the
+		 * properties being updated.
+		 */
+		vd = *prop_data++;
+		prop_data += vd;
+
+		/* The path we skipped over is counted as one of the elements
+		 * returned so start counting at one.
+		 */
+		for (i = 1; i < upwa->nprops; i++) {
 			char *prop_name;
-			u32 vd;
 
-			prop_name = prop_data + 1;
+			prop_name = prop_data;
 			prop_data += strlen(prop_name) + 1;
-			vd = *prop_data++;
+			vd = *(u32 *)prop_data;
+			prop_data += sizeof(vd);
 
 			switch (vd) {
 			case 0x00000000: