[PATCH v2 RESEND] EDAC/ti: Fix possible null pointer dereference in _emif_get_id()

[Ma Ke <make24@iscas.ac.cn>]

In _emif_get_id(), of_get_address() may return NULL which is later
dereferenced. Fix this bug by adding NULL check.

Cc: stable@vger.kernel.org
Fixes: 86a18ee21e5e ("EDAC, ti: Add support for TI keystone and DRA7xx EDAC")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
Changes in v2:
- added Cc stable line.
---
 drivers/edac/ti_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/ti_edac.c b/drivers/edac/ti_edac.c
index 29723c9592f7..db23887b2d81 100644
--- a/drivers/edac/ti_edac.c
+++ b/drivers/edac/ti_edac.c
@@ -207,6 +207,9 @@ static int _emif_get_id(struct device_node *node)
 	int my_id = 0;
 
 	addrp = of_get_address(node, 0, NULL, NULL);
+	if (!addrp)
+		return -EINVAL;
+
 	my_addr = (u32)of_translate_address(node, addrp);
 
 	for_each_matching_node(np, ti_edac_of_match) {
-- 
2.25.1