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dm: core: Check for empty list in uclass_find_device()

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This function needs to check the list has entries before traversing it.
Fix this bug.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2015-07-31 09:31:19 -06:00
parent 3834f41720
commit 2fda14ae6a
1 changed files with 2 additions and 0 deletions
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2
drivers/core/uclass.c
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@@ -153,6 +153,8 @@ int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
ret = uclass_get(id, &uc); ret = uclass_get(id, &uc);
if (ret) if (ret)
return ret; return ret;
if (list_empty(&uc->dev_head))
return -ENODEV;
list_for_each_entry(dev, &uc->dev_head, uclass_node) { list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (!index--) { if (!index--) {