Use additional checks in skiboot for pointers

The checks validate pointers sent in using
opal_addr_valid() in opal_call API's provided
via the console, cpu, fdt, flash, i2c, interrupts,
nvram, opal-msg, opal, opal-pci, xscom and
cec modules

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/core/fdt.c b/core/fdt.c
index 79122b7..eabbd54 100644
--- a/core/fdt.c
+++ b/core/fdt.c
@@ -221,6 +221,9 @@ static int64_t opal_get_device_tree(uint32_t phandle,
 	int64_t totalsize;
 	int ret;
 
+	if (!opal_addr_valid(fdt))
+		return OPAL_PARAMETER;
+
 	root = dt_find_by_phandle(dt_root, phandle);
 	if (!root)
 		return OPAL_PARAMETER;