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@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Gaurav Minocha <gaurav.minocha.os@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+
---
drivers/of/selftest.c | 3 +--
1 file changed, 1 insertion(+), 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--;
}
}
--
1.9.1
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