[Xen-changelog] [xen stable-4.11] xen/arm: check for multiboot nodes only under /chosen

[patchbot@xxxxxxx]

commit 02fd1ee8ce00ca2a1b89bb17703d667209fc49fb
Author:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
AuthorDate: Tue Nov 13 08:45:49 2018 -0800
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Jan 25 17:06:19 2019 -0800

    xen/arm: check for multiboot nodes only under /chosen
    
    Make sure to only look for multiboot compatible nodes only under
    /chosen, not under any other paths (depth <= 3).
    
    Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
    [julien: Use sizeof(path) instead of len ]
    Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
    
    (cherry picked from commit c32e3689c546305d4eae53e6ccf9c8b4e048c7df)
---
 xen/arch/arm/bootfdt.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 8eba42c7b9..797fcefd9e 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -174,6 +174,14 @@ static void __init process_multiboot_node(const void *fdt, 
int node,
     paddr_t start, size;
     const char *cmdline;
     int len;
+    /* sizeof("/chosen/") + DT_MAX_NAME + '/' + DT_MAX_NAME + '/0' => 92 */
+    char path[92];
+    int ret;
+
+    /* Check that the node is under "/chosen" (first 7 chars of path) */
+    ret = fdt_get_path(fdt, node, path, sizeof (path));
+    if ( ret != 0 || strncmp(path, "/chosen", 7) )
+        return;
 
     prop = fdt_get_property(fdt, node, "reg", &len);
     if ( !prop )
@@ -286,8 +294,8 @@ static int __init early_scan_node(const void *fdt,
 {
     if ( device_tree_node_matches(fdt, node, "memory") )
         process_memory_node(fdt, node, name, address_cells, size_cells);
-    else if ( device_tree_node_compatible(fdt, node, "xen,multiboot-module" ) 
||
-              device_tree_node_compatible(fdt, node, "multiboot,module" ))
+    else if ( depth <= 3 && (device_tree_node_compatible(fdt, node, 
"xen,multiboot-module" ) ||
+              device_tree_node_compatible(fdt, node, "multiboot,module" )))
         process_multiboot_node(fdt, node, name, address_cells, size_cells);
     else if ( depth == 1 && device_tree_node_matches(fdt, node, "chosen") )
         process_chosen_node(fdt, node, name, address_cells, size_cells);
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.11

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