From bcf28a2f284643060cdee550290ca2c2a559aa8e Mon Sep 17 00:00:00 2001 From: Xinming Hu Date: Fri, 18 Nov 2016 19:30:30 +0530 Subject: [PATCH] mwifiex: reset card->adapter during device unregister card->adapter gets initialized in mwifiex_register_dev(). As it's not cleared in mwifiex_unregister_dev(), we may end up accessing the memory which is already free in below scenario. Scenario: Driver initialization is failed due to incorrect firmware or some other reason. Meanwhile device reboot/unload occurs. This is safe, now that we've properly synchronized suspend() and remove() with the FW initialization thread; now that code can simply check for 'card->adapter == NULL' and exit safely. Signed-off-by: Xinming Hu Tested-by: Xinming Hu Signed-off-by: Amitkumar Karwar Signed-off-by: Brian Norris Signed-off-by: Kalle Valo --- drivers/net/wireless/marvell/mwifiex/pcie.c | 1 + drivers/net/wireless/marvell/mwifiex/sdio.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index 6176cb78d9d67..f6d28d98da8d7 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c @@ -3042,6 +3042,7 @@ static void mwifiex_unregister_dev(struct mwifiex_adapter *adapter) if (card->msi_enable) pci_disable_msi(pdev); } + card->adapter = NULL; } } diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c index 5077d56b1bd49..69542f802de5d 100644 --- a/drivers/net/wireless/marvell/mwifiex/sdio.c +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c @@ -2017,6 +2017,7 @@ mwifiex_unregister_dev(struct mwifiex_adapter *adapter) struct sdio_mmc_card *card = adapter->card; if (adapter->card) { + card->adapter = NULL; sdio_claim_host(card->func); sdio_disable_func(card->func); sdio_release_host(card->func);