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authorGrant Likely <grant.likely@linaro.org>2014-11-19 16:22:32 +0000
committerGrant Likely <grant.likely@linaro.org>2014-11-19 17:42:57 +0000
commitc1a2086e2d8c4eb4e8630ba752e911ec180dec67 (patch)
treea7234d01a8647f98e644e89a3b2675b2de4e1c30 /drivers/of
parenta0e27f51ba8a04125c22a95c4d3e98297a7191de (diff)
downloadlinux-c1a2086e2d8c4eb4e8630ba752e911ec180dec67.tar.bz2
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+
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/selftest.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 11b873c54a77..e6c14dc400e9 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -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--;
}
}