The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x bd50a974097bb82d52a458bd3ee39fb723129a0c # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024073007-discover-unearned-d69c@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

bd50a974097b ("devres: Fix memory leakage caused by driver API devm_free_percpu()") d7aa44f5a1f8 ("driver core: Cast to (void *) with __force for __percpu pointer")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From bd50a974097bb82d52a458bd3ee39fb723129a0c Mon Sep 17 00:00:00 2001 From: Zijun Hu quic_zijuhu@quicinc.com Date: Tue, 2 Jul 2024 22:51:51 +0800 Subject: [PATCH] devres: Fix memory leakage caused by driver API devm_free_percpu()

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@vger.kernel.org Signed-off-by: Zijun Hu quic_zijuhu@quicinc.com Link: https://lore.kernel.org/r/1719931914-19035-3-git-send-email-quic_zijuhu@quic... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ff2247eec43c..8d709dbd4e0c 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -1225,7 +1225,11 @@ 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);