Commit c1a2086e authored Nov 19, 2014 by Grant Likely

of/selftest: Fix off-by-one error in removal path



The removal path for selftest data has an off by one error that causes
the code to dereference beyond the end of the nodes[] array on the first
pass through. The old code only worked by chance on a lot of platforms,
but the bug was recently exposed on aarch64.

The fix is simple. Decrement the node count before dereferencing, not
after.

Reported-by: Kevin Hilman <khilman@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Gaurav Minocha <gaurav.minocha.os@gmail.com>
Cc: <stable@vger.kernel.org> # v3.17+

parent a0e27f51

drivers/of/selftest.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -896,7 +896,7 @@ static void selftest_data_remove(void)
		return;
		}

		while (last_node_index >= 0) {
		while (last_node_index-- > 0) {
		if (nodes[last_node_index]) {
		np = of_find_node_by_path(nodes[last_node_index]->full_name);
		if (strcmp(np->full_name, "/aliases") != 0) {
		@@ -908,7 +908,6 @@ static void selftest_data_remove(void)
		}
		}
		}
		last_node_index--;
		}
		}