linux-kernel - [PATCH 4.14 257/267] media: vimc: fix component match compare

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Message-Id: <20191216174916.788330411@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:49:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Helen Koike <helen.koike@...labora.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 257/267] media: vimc: fix component match compare

From: Helen Koike <helen.koike@...labora.com>

[ Upstream commit ee1c71a8e1456ab53fe667281d855849edf26a4d ]

If the system has other devices being registered in the component
framework, the compare function will be called with a device that
doesn't belong to vimc.
This device is not necessarily a platform_device, nor have a
platform_data (which causes a NULL pointer dereference error) and if it
does have a pdata, it is not necessarily type of struct vimc_platform_data.
So casting to any of these types is wrong.

Instead of expecting a given pdev with a given pdata, just expect for
the device it self. vimc-core is the one who creates them, we know in
advance exactly which object to expect in the match.

Fixes: 4a29b7090749 ("[media] vimc: Subdevices as modules")

Signed-off-by: Helen Koike <helen.koike@...labora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Tested-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/vimc/vimc-core.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/vimc/vimc-core.c b/drivers/media/platform/vimc/vimc-core.c
index 57e5d6a020b0e..447a01ff4e23c 100644
--- a/drivers/media/platform/vimc/vimc-core.c
+++ b/drivers/media/platform/vimc/vimc-core.c
@@ -243,10 +243,7 @@ static void vimc_comp_unbind(struct device *master)
 
 static int vimc_comp_compare(struct device *comp, void *data)
 {
-	const struct platform_device *pdev = to_platform_device(comp);
-	const char *name = data;
-
-	return !strcmp(pdev->dev.platform_data, name);
+	return comp == data;
 }
 
 static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
@@ -275,7 +272,7 @@ static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
 		}
 
 		component_match_add(&vimc->pdev.dev, &match, vimc_comp_compare,
-				    (void *)vimc->pipe_cfg->ents[i].name);
+				    &vimc->subdevs[i]->dev);
 	}
 
 	return match;
-- 
2.20.1