linux-kernel - [PATCH 2/2] rapidio: rio-scan: fix error handling in rio_scan_alloc

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Date:   Sat, 12 Nov 2022 20:59:35 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <mporter@...nel.crashing.org>, <alex.bou9@...il.com>,
        <akpm@...ux-foundation.org>
Subject: [PATCH 2/2] rapidio: rio-scan: fix error handling in rio_scan_alloc_net()

This patch fixes two error handling issues:

rio_free_net() calls device_unregister(), if allocate idtab fails
in rio_scan_alloc_net(), the device has not been registered, in
this error case, can not call rio_free_net(), use kfree() instead.

If rio_add_net() returns error in rio_scan_alloc_net(), it's need
call put_device() to free memory allocated in rio_alloc_net() and
dev_set_name().

Fixes: e6b585ca6e81 ("rapidio: move net allocation into core code")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/rapidio/rio-scan.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 19b0c33f4a62..2350c0cb2329 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -850,7 +850,7 @@ static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
 
 		if (idtab == NULL) {
 			pr_err("RIO: failed to allocate destID table\n");
-			rio_free_net(net);
+			kfree(net);
 			net = NULL;
 		} else {
 			net->enum_data = idtab;
@@ -867,7 +867,10 @@ static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
 		dev_set_name(&net->dev, "rnet_%d", net->id);
 		net->dev.parent = &mport->dev;
 		net->dev.release = rio_scan_release_dev;
-		rio_add_net(net);
+		if (rio_add_net(net)) {
+			put_device(&net->dev);
+			net = NULL;
+		}
 	}
 
 	return net;
-- 
2.25.1