[PATCH 4.2 105/120] of/address: Dont loop forever in of_find_matching_node_by_address().

Greg Kroah-Hartman
2015-09-19T17:58:57Z

From: David Daney <david.daney@cavium.com>

commit 3a496b00b6f90c41bd21a410871dfc97d4f3c7ab upstream.

If the internal call to of_address_to_resource() fails, we end up
looping forever in of_find_matching_node_by_address(). This can be
caused by a defective device tree, or calling with an incorrect
matches argument.

Fix by calling of_find_matching_node() unconditionally at the end of
the loop.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/of/address.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -845,10 +845,10 @@ struct device_node *of_find_matching_nod
struct resource res;

while (dn) {
- if (of_address_to_resource(dn, 0, &res))
- continue;
- if (res.start == base_address)
+ if (!of_address_to_resource(dn, 0, &res) &&
+ res.start == base_address)
return dn;
+
dn = of_find_matching_node(dn, matches);
}