Hi Suzuki,
On Wednesday 06 June 2018 03:13 AM, Suzuki K Poulose wrote:
commit 6403587a930c ("coresight: use put_device() instead of kfree()")
introduced a memory leak where, if we fail to register the device
for coresight_device, we don't free the "coresight_device" object,
which was allocated via kzalloc(). Fix this by jumping to the
appropriate error path.
put_device() will decrement the last reference and then
free the memory by calling dev->release. Internally
put_device() -> kobject_put() -> kobject_cleanup() which is
responsible to call 'dev -> release' and also free other kobject
resources. If you will see the coresight_device_release. There
we are releasing all allocated memory. Still if you call kfree() again
then it'll be redundancy.
~arvind
Fixes: commit 6403587a930c ("coresight: use put_device() instead of kfree()")
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
drivers/hwtracing/coresight/coresight.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 4969b32..2893cfe 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1020,7 +1020,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
ret = device_register(&csdev->dev);
if (ret) {
put_device(&csdev->dev);
- goto err_kzalloc_csdev;
+ goto err_kzalloc_refcnts;
}
mutex_lock(&coresight_mutex);
--
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