of: dynamic: Fix potential memory leak in of_changeset_action()

Smatch complains that the error path where "action" is invalid leaks
the "ce" allocation:
    drivers/of/dynamic.c:935 of_changeset_action()
    warn: possible memory leak of 'ce'

Fix this by doing the validation before the allocation.

Note that there is not any actual problem with upstream kernels. All
callers of of_changeset_action() are static inlines with fixed action
values.

Fixes: 914d9d831e61 ("of: dynamic: Refactor action prints to not use "%pOF" inside devtree_lock")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202309011059.EOdr4im9-lkp@intel.com/
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/7dfaf999-30ad-491c-9615-fb1138db121c@moroto.mountain
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 0a3483e..f63250c 100644 (file)
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -890,13 +890,13 @@ int of_changeset_action(struct of_changeset *ocs, unsigned long action,
 {
        struct of_changeset_entry *ce;
 
+       if (WARN_ON(action >= ARRAY_SIZE(action_names)))
+               return -EINVAL;
+
        ce = kzalloc(sizeof(*ce), GFP_KERNEL);
        if (!ce)
                return -ENOMEM;
 
-       if (WARN_ON(action >= ARRAY_SIZE(action_names)))
-               return -EINVAL;
-
        /* get a reference to the node */
        ce->action = action;
        ce->np = of_node_get(np);