[PATCH] of: overlay: validate offset from property fixups

[frowand . list]

From: Frank Rowand <frank.row...@sony.com>

The smatch static checker marks the data in offset as untrusted,
leading it to warn:

  drivers/of/resolver.c:125 update_usages_of_a_phandle_reference()
  error: buffer underflow 'prop->value' 's32min-s32max'

Add check to verify that offset is within the property data.

Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Frank Rowand <frank.row...@sony.com>
---
 drivers/of/resolver.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index 65d0b7adfcd4..7edfac6f1914 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -122,6 +122,11 @@ static int update_usages_of_a_phandle_reference(struct 
device_node *overlay,
                        goto err_fail;
                }
 
+               if (offset < 0 || offset + sizeof(__be32) > prop->length) {
+                       err = -EINVAL;
+                       goto err_fail;
+               }
+
                *(__be32 *)(prop->value + offset) = cpu_to_be32(phandle);
        }
 
-- 
Frank Rowand <frank.row...@sony.com>