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authorGrant Likely <grant.likely@linaro.org>2014-10-01 17:57:07 +0200
committerGrant Likely <grant.likely@linaro.org>2014-10-01 18:01:43 +0200
commite66c98c7a0eacc33a9369a3ec086740044eb986c (patch)
tree639990268861bd1aae22d93b6f92bbbd47768192
parentLinux 3.17-rc7 (diff)
downloadlinux-e66c98c7a0eacc33a9369a3ec086740044eb986c.tar.xz
linux-e66c98c7a0eacc33a9369a3ec086740044eb986c.zip
of: Fix NULL dereference in selftest removal code
The selftest code removes its testcase data from the live tree when exiting, but if the testcases data tree contains an empty child of the root, then it causes an oops due to a NULL dereference. The reason is that the code tries to directly dereference the child pointer without checking first if a child is actually there. The solution is to pass the parent node into detach_node_and_children() instead of trying to pass the child. This required removing the code that attempts to remove all of the sibling nodes in detach_node_and_children(), which was never sensible in the first place. At the same time add a check to make sure the bounds of the nodes list are not exceeded by the testdata tree. If they are then abort. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Gaurav Minocha <gaurav.minocha.os@gmail.com>
-rw-r--r--drivers/of/selftest.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index a737cb5974de..883e60b04eb5 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -637,6 +637,8 @@ static int attach_node_and_children(struct device_node *np)
dup = np;
while (dup) {
+ if (WARN_ON(last_node_index >= NO_OF_NODES))
+ return -EINVAL;
nodes[last_node_index++] = dup;
dup = dup->sibling;
}
@@ -717,10 +719,6 @@ static void detach_node_and_children(struct device_node *np)
{
while (np->child)
detach_node_and_children(np->child);
-
- while (np->sibling)
- detach_node_and_children(np->sibling);
-
of_detach_node(np);
}
@@ -749,8 +747,7 @@ static void selftest_data_remove(void)
if (nodes[last_node_index]) {
np = of_find_node_by_path(nodes[last_node_index]->full_name);
if (strcmp(np->full_name, "/aliases") != 0) {
- detach_node_and_children(np->child);
- of_detach_node(np);
+ detach_node_and_children(np);
} else {
for_each_property_of_node(np, prop) {
if (strcmp(prop->name, "testcase-alias") == 0)