[PATCH v3 3/9] dmaengine: idxd: fix memory leak in error handling path of idxd_setup_groups

[Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx>]

Memory allocated for groups is not freed if an error occurs during
idxd_setup_groups(). To fix it, free the allocated memory in the reverse
order of allocation before exiting the function in case of an error.

Fixes: defe49f96012 ("dmaengine: idxd: fix group conf_dev lifetime")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
 drivers/dma/idxd/init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 635838a81e0f..fe4a14813bba 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -326,6 +326,7 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 		rc = dev_set_name(conf_dev, "group%d.%d", idxd->id, group->id);
 		if (rc < 0) {
 			put_device(conf_dev);
+			kfree(group);
 			goto err;
 		}
 
@@ -350,7 +351,10 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 	while (--i >= 0) {
 		group = idxd->groups[i];
 		put_device(group_confdev(group));
+		kfree(group);
 	}
+	kfree(idxd->groups);
+
 	return rc;
 }
 
-- 
2.39.3