linux-kernel - [PATCH AUTOSEL for 4.9 18/56] mwifiex: sdio: fix use after free issue for save

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Date:   Wed, 15 Nov 2017 02:45:39 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Amitkumar Karwar <akarwar@...vell.com>,
        Kalle Valo <kvalo@...eaurora.org>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 18/56] mwifiex: sdio: fix use after free issue
 for save_adapter

From: Amitkumar Karwar <akarwar@...vell.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@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/wireless/marvell/mwifiex/sdio.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 8718950004f3..8d601dcf2948 100644
--- 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(struct sdio_mmc_card *card)
 	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);
 }
 
-- 
2.11.0