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staging: rtl8188eu: Fix a possible sleep-in-atomic-context bug in rtw_disassoc_cmd()

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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 <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia-Ju Bai 2018-06-20 18:01:19 +08:00 committed by Greg Kroah-Hartman
parent f62252bf39
commit f444263462
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/rtl8188eu/core/rtw_cmd.c
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@ -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;