mwifiex: sdio: fix use after free issue for save_adapter

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>

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 740d79c..43facba 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -2237,6 +2237,12 @@ 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);
 }