linux-kernel - [PATCH][media-next] media: davinci_vpfe: fix memory leaks of params

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Date:   Wed,  2 May 2018 10:16:58 +0100
From:   Colin King <colin.king@...onical.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][media-next] media: davinci_vpfe: fix memory leaks of params

From: Colin Ian King <colin.king@...onical.com>

There are memory leaks of params; when copy_to_user fails and also
the exit via the label 'error'.  Fix this by kfree'ing params in
error exit path and jumping to this on the copy_to_user failure path.

Detected by CoverityScan, CID#1467966 ("Resource leak")

Fixes: da43b6ccadcf ("[media] davinci: vpfe: dm365: add IPIPE support for media controller driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/staging/media/davinci_vpfe/dm365_ipipe.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/davinci_vpfe/dm365_ipipe.c b/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
index 95942768639c..3e67ee6e92f9 100644
--- a/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
+++ b/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
@@ -1252,12 +1252,12 @@ static const struct ipipe_module_if ipipe_modules[VPFE_IPIPE_MAX_MODULES] = {
 static int ipipe_s_config(struct v4l2_subdev *sd, struct vpfe_ipipe_config *cfg)
 {
 	struct vpfe_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
+	struct ipipe_module_params *params;
 	unsigned int i;
 	int rval = 0;
 
 	for (i = 0; i < ARRAY_SIZE(ipipe_modules); i++) {
 		const struct ipipe_module_if *module_if;
-		struct ipipe_module_params *params;
 		void *from, *to;
 		size_t size;
 
@@ -1275,7 +1275,7 @@ static int ipipe_s_config(struct v4l2_subdev *sd, struct vpfe_ipipe_config *cfg)
 		if (to && from && size) {
 			if (copy_from_user(to, (void __user *)from, size)) {
 				rval = -EFAULT;
-				break;
+				goto error;
 			}
 			rval = module_if->set(ipipe, to);
 			if (rval)
@@ -1287,7 +1287,9 @@ static int ipipe_s_config(struct v4l2_subdev *sd, struct vpfe_ipipe_config *cfg)
 		}
 		kfree(params);
 	}
+	return rval;
 error:
+	kfree(params);
 	return rval;
 }
 
-- 
2.17.0