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| author | Florian Fainelli <f.fainelli@gmail.com> | 2014-05-28 21:39:02 +0400 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2014-06-04 13:46:01 +0400 |
| commit | 43cb43678705e39b175b325f17938295996aefc7 (patch) | |
| tree | 0c238470709c70f60714245816e6437efb0cdef1 /drivers/of/base.c | |
| parent | 64c5c759084e153272eb05f4103de3e0adf5a88a (diff) | |
| download | linux-43cb43678705e39b175b325f17938295996aefc7.tar.xz | |
of: handle NULL node in next_child iterators
Add an early check for the node argument in __of_get_next_child and
of_get_next_available_child() to avoid dereferencing a NULL node pointer
a few lines after.
CC: Daniel Mack <zonque@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of/base.c')
| -rw-r--r-- | drivers/of/base.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index e67b308819c9..567e6e1b7921 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -700,6 +700,9 @@ static struct device_node *__of_get_next_child(const struct device_node *node, { struct device_node *next; + if (!node) + return NULL; + next = prev ? prev->sibling : node->child; for (; next; next = next->sibling) if (of_node_get(next)) @@ -746,6 +749,9 @@ struct device_node *of_get_next_available_child(const struct device_node *node, struct device_node *next; unsigned long flags; + if (!node) + return NULL; + raw_spin_lock_irqsave(&devtree_lock, flags); next = prev ? prev->sibling : node->child; for (; next; next = next->sibling) { |