4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
[ 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>
---
drivers/base/devres.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 7b4346798d5fb..a64f70a62e28f 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -1057,7 +1057,11 @@ 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);
--
2.43.0
