linux-kernel - [PATCH] iio:core: In map_array_register() cleanup in case of error

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Date:   Sun, 11 Oct 2020 14:41:20 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     jic23@...nel.org
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: [PATCH] iio:core: In map_array_register() cleanup in case of error

In function map_array_register() properly rewind in case of error.
Furthermore save an extra label by using a break instead of goto to leave
the concerning loop.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
---
 drivers/iio/inkern.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 5a8351c..0735cc4 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -28,6 +28,7 @@ int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
 {
 	int i = 0, ret = 0;
 	struct iio_map_internal *mapi;
+	struct list_head *pos, *tmp;

 	if (maps == NULL)
 		return 0;
@@ -37,14 +38,22 @@ int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
 		mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
 		if (mapi == NULL) {
 			ret = -ENOMEM;
-			goto error_ret;
+			break;
 		}
 		mapi->map = &maps[i];
 		mapi->indio_dev = indio_dev;
 		list_add_tail(&mapi->l, &iio_map_list);
 		i++;
 	}
-error_ret:
+
+	if (ret) { /* undo */
+		while (i--) {
+			mapi = list_last_entry(&iio_map_list,
+					       struct iio_map_internal, l);
+			list_del(&mapi->l);
+			kfree(mapi);
+		}
+	}
 	mutex_unlock(&iio_map_list_lock);

 	return ret;
--
2.7.4