linux-kernel - [PATCH] soc: fsl: qe: Fix refcount leak in par_io_of

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Date:   Sun,  3 Apr 2022 12:19:20 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Paul Mackerras <paulus@...ba.org>,
        Shlomi Gridish <gridish@...escale.com>,
        Kim Phillips <kim.phillips@...escale.com>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] soc: fsl: qe: Fix refcount leak in par_io_of_config

The device_node pointer is returned by of_parse_phandle() with
refcount incremented. We should use of_node_put() on it when done.
This function only calls of_node_put() in the regular path.
And it will cause refcount leak in error path.

Fixes: 986585385131 ("[POWERPC] Add QUICC Engine (QE) infrastructure")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/soc/fsl/qe/qe_io.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_io.c b/drivers/soc/fsl/qe/qe_io.c
index a5e2d0e5ab51..9f5f746bea88 100644
--- a/drivers/soc/fsl/qe/qe_io.c
+++ b/drivers/soc/fsl/qe/qe_io.c
@@ -159,12 +159,12 @@ int par_io_of_config(struct device_node *np)
 	pio_map = of_get_property(pio, "pio-map", &pio_map_len);
 	if (pio_map == NULL) {
 		printk(KERN_ERR "pio-map is not set!\n");
-		return -1;
+		goto err_node_put;
 	}
 	pio_map_len /= sizeof(unsigned int);
 	if ((pio_map_len % 6) != 0) {
 		printk(KERN_ERR "pio-map format wrong!\n");
-		return -1;
+		goto err_node_put;
 	}
 
 	while (pio_map_len > 0) {
@@ -182,5 +182,9 @@ int par_io_of_config(struct device_node *np)
 	}
 	of_node_put(pio);
 	return 0;
+
+err_node_put:
+	of_node_put(pio);
+	return -1;
 }
 EXPORT_SYMBOL(par_io_of_config);
-- 
2.17.1