From f44426346289fee0a5c4bb366583fea71da0b95d Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai Date: Wed, 20 Jun 2018 18:01:19 +0800 Subject: [PATCH] staging: rtl8188eu: Fix a possible sleep-in-atomic-context bug in rtw_disassoc_cmd() The driver may sleep with holding a spinlock. The function call paths (from bottom to top) in Linux-4.16.7 are: [FUNC] kzalloc(GFP_KERNEL) drivers/staging/rtl8188eu/core/rtw_cmd.c, 502: kzalloc in rtw_disassoc_cmd drivers/staging/rtl8188eu/core/rtw_ioctl_set.c, 256: rtw_disassoc_cmd in rtw_set_802_11_ssid drivers/staging/rtl8188eu/core/rtw_ioctl_set.c, 235: spin_lock_bh in rtw_set_802_11_ssid [FUNC] kzalloc(GFP_KERNEL) drivers/staging/rtl8188eu/core/rtw_cmd.c, 502: kzalloc in rtw_disassoc_cmd drivers/staging/rtl8188eu/core/rtw_ioctl_set.c, 352: rtw_disassoc_cmd in rtw_set_802_11_infrastructure_mode drivers/staging/rtl8188eu/core/rtw_ioctl_set.c, 336: spin_lock_bh in rtw_set_802_11_infrastructure_mode To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC. This bug is found by my static analysis tool (DSAC-2) and checked by my code review. Signed-off-by: Jia-Ju Bai Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8188eu/core/rtw_cmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/rtl8188eu/core/rtw_cmd.c b/drivers/staging/rtl8188eu/core/rtw_cmd.c index 72099f5d6915..a4654c85ca78 100644 --- a/drivers/staging/rtl8188eu/core/rtw_cmd.c +++ b/drivers/staging/rtl8188eu/core/rtw_cmd.c @@ -499,7 +499,7 @@ u8 rtw_disassoc_cmd(struct adapter *padapter, u32 deauth_timeout_ms, bool enqueu RT_TRACE(_module_rtl871x_cmd_c_, _drv_notice_, ("+%s\n", __func__)); /* prepare cmd parameter */ - param = kzalloc(sizeof(*param), GFP_KERNEL); + param = kzalloc(sizeof(*param), GFP_ATOMIC); if (!param) { res = _FAIL; goto exit;