This is a note to let you know that I've just added the patch titled
devres: Fix memory leakage caused by driver API devm_free_percpu()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
devres-fix-memory-leakage-caused-by-driver-api-devm_.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b4dd1e6befe5c8cbf20583c023aa39c0ff3238f8
Author: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
Date: Tue Jul 2 22:51:51 2024 +0800
devres: Fix memory leakage caused by driver API devm_free_percpu()
[ Upstream commit bd50a974097bb82d52a458bd3ee39fb723129a0c ]
It will cause memory leakage when use driver API devm_free_percpu()
to free memory allocated by devm_alloc_percpu(), fixed by using
devres_release() instead of devres_destroy() within devm_free_percpu().
Fixes: ff86aae3b411 ("devres: add devm_alloc_percpu()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/1719931914-19035-3-git-send-email-quic_zijuhu@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index e8ad6a41ad4ce..5a84bafae3288 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -1111,7 +1111,11 @@ EXPORT_SYMBOL_GPL(__devm_alloc_percpu);
*/
void devm_free_percpu(struct device *dev, void __percpu *pdata)
{
- WARN_ON(devres_destroy(dev, devm_percpu_release, devm_percpu_match,
+ /*
+ * Use devres_release() to prevent memory leakage as
+ * devm_free_pages() does.
+ */
+ WARN_ON(devres_release(dev, devm_percpu_release, devm_percpu_match,
(__force void *)pdata));
}
EXPORT_SYMBOL_GPL(devm_free_percpu);
