linux-kernel - [PATCH] mcb: fix error handling for different scenarios when parsing

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Message-ID: <20230906143605.1877335-1-jorge.sanjuangarcia@duagon.com>
Date:   Wed, 6 Sep 2023 14:36:43 +0000
From:   Sanjuán García, Jorge 
        <Jorge.SanjuanGarcia@...gon.com>
To:     "jirislaby@...nel.org" <jirislaby@...nel.org>
CC:     "morbidrsa@...il.com" <morbidrsa@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jth@...nel.org" <jth@...nel.org>,
        Rodríguez Barbarin, José Javier 
        <JoseJavier.Rodriguez@...gon.com>,
        "yangyingliang@...wei.com" <yangyingliang@...wei.com>,
        Sanjuán García, Jorge 
        <Jorge.SanjuanGarcia@...gon.com>
Subject: [PATCH] mcb: fix error handling for different scenarios when parsing

chameleon_parse_gdd() may fail for different reasons and end up
in the err tag. Make sure we at least make sure we always free
the mcb_device allocated with mcb_alloc_dev().

If mcb_device_register() fails, make sure to give up the reference
in the same place the device was added.

Fixes: 728ac3389296 ("mcb: mcb-parse: fix error handing in chameleon_parse_gdd()")
Reviewed-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@...gon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
---
 drivers/mcb/mcb-core.c  | 1 +
 drivers/mcb/mcb-parse.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mcb/mcb-core.c b/drivers/mcb/mcb-core.c
index 2f23b9c3b751..f797d078978f 100644
--- a/drivers/mcb/mcb-core.c
+++ b/drivers/mcb/mcb-core.c
@@ -247,6 +247,7 @@ int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
 	return 0;
 
 out:
+	put_device(&dev->dev);
 
 	return ret;
 }
diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c
index 656b6b71c768..1ae37e693de0 100644
--- a/drivers/mcb/mcb-parse.c
+++ b/drivers/mcb/mcb-parse.c
@@ -106,7 +106,7 @@ static int chameleon_parse_gdd(struct mcb_bus *bus,
 	return 0;
 
 err:
-	put_device(&mdev->dev);
+	mcb_free_dev(mdev);
 
 	return ret;
 }
-- 
2.34.1