From 80ba4f1d365af206b9e818d17d22fed02fe5def0 Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Fri, 16 Sep 2016 10:37:31 +0100 Subject: [PATCH] mwifiex: fix null pointer deference when adapter is null If adapter is null the error exit path in mwifiex_shutdown_sw is to down the semaphore sem and print some debug via mwifiex_dbg. However, passing a NULL adapter to mwifiex_dbg causes a null pointer deference when accessing adapter->dev. This fix checks for a null adapter at the start of the function and to exit without the need to up the semaphore and we also skip the debug to avoid the null pointer dereference. Signed-off-by: Colin Ian King Signed-off-by: Kalle Valo --- drivers/net/wireless/marvell/mwifiex/main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c index 9b2e98cfe090..2478ccd6f2d9 100644 --- a/drivers/net/wireless/marvell/mwifiex/main.c +++ b/drivers/net/wireless/marvell/mwifiex/main.c @@ -1369,12 +1369,12 @@ mwifiex_shutdown_sw(struct mwifiex_adapter *adapter, struct semaphore *sem) struct mwifiex_private *priv; int i; + if (!adapter) + goto exit_return; + if (down_interruptible(sem)) goto exit_sem_err; - if (!adapter) - goto exit_remove; - priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); mwifiex_deauthenticate(priv, NULL); @@ -1430,10 +1430,10 @@ mwifiex_shutdown_sw(struct mwifiex_adapter *adapter, struct semaphore *sem) rtnl_unlock(); } -exit_remove: up(sem); exit_sem_err: mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__); +exit_return: return 0; } -- 2.39.2