On Fri, 23 May 2014 12:43:11 -0700, Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
> Add an early check for the node argument in
> of_get_next_available_child() to avoid dereferencing a NULL node pointer
> a few lines after.
>
> CC: Daniel Mack <zonque@xxxxxxxxx>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Is there a bug that exposed this path? I'd like some more justification
before merging this patch, particularly considering of_get_next_child()
doesn't check for it either, but you're not modifying that function.
g.
> ---
> drivers/of/base.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index e67b308819c9..9a71bfac78ae 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -746,6 +746,9 @@ 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) {
> --
> 1.9.1
>
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