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Subject[PATCH 4.15 60/60] fpga: region: release of_parse_phandle nodes after use
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ian Abbott <abbotti@mev.co.uk>

commit 0f5eb1545907edeea7672a9c1652c4231150ff22 upstream.

Both fpga_region_get_manager() and fpga_region_get_bridges() call
of_parse_phandle(), but nothing calls of_node_put() on the returned
struct device_node pointers. Make sure to do that to stop their
reference counters getting out of whack.

Fixes: 0fa20cdfcc1f ("fpga: fpga-region: device tree control for FPGA")
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


---
drivers/fpga/fpga-region.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -147,6 +147,7 @@ static struct fpga_manager *fpga_region_
mgr_node = of_parse_phandle(np, "fpga-mgr", 0);
if (mgr_node) {
mgr = of_fpga_mgr_get(mgr_node);
+ of_node_put(mgr_node);
of_node_put(np);
return mgr;
}
@@ -192,10 +193,13 @@ static int fpga_region_get_bridges(struc
parent_br = region_np->parent;

/* If overlay has a list of bridges, use it. */
- if (of_parse_phandle(overlay, "fpga-bridges", 0))
+ br = of_parse_phandle(overlay, "fpga-bridges", 0);
+ if (br) {
+ of_node_put(br);
np = overlay;
- else
+ } else {
np = region_np;
+ }

for (i = 0; ; i++) {
br = of_parse_phandle(np, "fpga-bridges", i);
@@ -203,12 +207,15 @@ static int fpga_region_get_bridges(struc
break;

/* If parent bridge is in list, skip it. */
- if (br == parent_br)
+ if (br == parent_br) {
+ of_node_put(br);
continue;
+ }

/* If node is a bridge, get it and add to list */
ret = fpga_bridge_get_to_list(br, region->info,
&region->bridge_list);
+ of_node_put(br);

/* If any of the bridges are in use, give up */
if (ret == -EBUSY) {

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