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NFC: nfcmrvl_uart: fix OF child-node lookup 

Use the new of_get_compatible_child() helper to lookup the nfc child
node instead of using of_find_compatible_node(), which searches the
entire tree from a given start node and thus can return an unrelated
(i.e. non-child) node.

This also addresses a potential use-after-free (e.g. after probe
deferral) as the tree-wide helper drops a reference to its first
argument (i.e. the parent node).

Fixes: e097dc624f ("NFC: nfcmrvl: add UART driver")
Fixes: d8e018c0b3 ("NFC: nfcmrvl: update device tree bindings for Marvell NFC")
Cc: stable <stable@vger.kernel.org>     # 4.2
Cc: Vincent Cuissard <cuissard@marvell.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Johan Hovold 2018-08-27 10:21:52 +02:00 committed by Rob Herring
parent ac63043d8c
commit 5bf59773aa
1 changed files with 2 additions and 3 deletions
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5
drivers/nfc/nfcmrvl/uart.c
View File

@ -73,10 +73,9 @@ static int nfcmrvl_uart_parse_dt(struct device_node *node,
struct device_node *matched_node;
int ret;
matched_node = of_find_compatible_node(node, NULL, "marvell,nfc-uart");
matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
if (!matched_node) {
matched_node = of_find_compatible_node(node, NULL,
"mrvl,nfc-uart");
matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
if (!matched_node)
return -ENODEV;
}