powerpc: Fix bug in kernel copy of libfdt's fdt_subnode_offset_namelen()

There's currently an off-by-one bug in fdt_subnode_offset_namelen()
which causes it to keep searching after it's finished the subnodes of
the given parent, and into the subnodes of siblings of the original
node which come after it in the tree.  This bug was introduced in
commit 7a5f208f6f69feb6f6653131ce7be9bdd8bca388 ("powerpc: Update
in-kernel dtc and libfdt to version 1.2.0").

A patch has already been submitted to dtc/libfdt mainline.  We don't
really want to pull in a new upstream version during the 2.6.28 cycle,
but we should still fix this bug, hence this standalone version of the
fix for the in-kernel libfdt.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/boot/libfdt/fdt_ro.c b/arch/powerpc/boot/libfdt/fdt_ro.c
index 129b532bcc1a8f9752caf666a0b1e45956e926eb..fbbba44fcd0d0ccd798b763c364df7b79aa66a72 100644 (file)
--- a/arch/powerpc/boot/libfdt/fdt_ro.c
+++ b/arch/powerpc/boot/libfdt/fdt_ro.c
@@ -104,8 +104,8 @@ int fdt_subnode_offset_namelen(const void *fdt, int offset,
 
        FDT_CHECK_HEADER(fdt);
 
-       for (depth = 0;
-            offset >= 0;
+       for (depth = 0, offset = fdt_next_node(fdt, offset, &depth);
+            (offset >= 0) && (depth > 0);
             offset = fdt_next_node(fdt, offset, &depth)) {
                if (depth < 0)
                        return -FDT_ERR_NOTFOUND;
@@ -114,7 +114,10 @@ int fdt_subnode_offset_namelen(const void *fdt, int offset,
                        return offset;
        }
 
-       return offset; /* error */
+       if (offset < 0)
+               return offset; /* error */
+       else
+               return -FDT_ERR_NOTFOUND;
 }
 
 int fdt_subnode_offset(const void *fdt, int parentoffset,