This is a note to let you know that I've just added the patch titled

mwifiex: sdio: fix use after free issue for save_adapter

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mwifiex-sdio-fix-use-after-free-issue-for-save_adapter.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Tue Nov 28 10:49:28 CET 2017

From: Amitkumar Karwar akarwar@marvell.com Date: Thu, 1 Dec 2016 19:23:31 +0530 Subject: mwifiex: sdio: fix use after free issue for save_adapter

From: Amitkumar Karwar akarwar@marvell.com

[ Upstream commit 74c8719b8ee0922593a5cbec0bd6127d86d8a2f4 ]

If we have sdio work requests received when sdio card reset is happening, we may end up accessing older save_adapter pointer later which is already freed during card reset. This patch solves the problem by cancelling those pending requests.

Signed-off-by: Amitkumar Karwar akarwar@marvell.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/marvell/mwifiex/sdio.c | 6 ++++++ 1 file changed, 6 insertions(+)

--- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -2296,6 +2296,12 @@ static void mwifiex_recreate_adapter(str mmc_hw_reset(func->card->host); sdio_release_host(func);

+ /* Previous save_adapter won't be valid after this. We will cancel + * pending work requests. + */ + clear_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &iface_work_flags); + clear_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &iface_work_flags); + mwifiex_sdio_probe(func, device_id); }

Patches currently in stable-queue which might be from akarwar@marvell.com are

queue-4.9/mwifiex-sdio-fix-use-after-free-issue-for-save_adapter.patch