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of/address: Don't loop forever in of_find_matching_node_by_address(). 

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: Zefan Li <lizefan@huawei.com>
This commit is contained in:
David Daney 2015-08-19 13:17:47 -07:00 committed by Zefan Li
parent 470940f18e
commit ec62ecdcf6
1 changed files with 3 additions and 3 deletions
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6
drivers/of/address.c
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@ -604,10 +604,10 @@ struct device_node *of_find_matching_node_by_address(struct device_node *from,
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);
}