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staging: rtl8723bs: Fix a sleep-in-atomic-context bug in issue_deauth_ex() 

The driver may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.17 are:

[FUNC] msleep
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 3805:
	msleep in issue_deauth_ex
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 6336:
	issue_deauth_ex in disconnect_hdl
drivers/staging/rtl8723bs/core/rtw_cmd.c, 963:
	disconnect_hdl in rtw_disassoc_cmd
drivers/staging/rtl8723bs/core/rtw_ioctl_set.c, 506:
	rtw_disassoc_cmd in rtw_set_802_11_disassociate
drivers/staging/rtl8723bs/core/rtw_ioctl_set.c, 501:
	spin_lock_bh in rtw_set_802_11_disassociate

[FUNC] msleep
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 3805:
	msleep in issue_deauth_ex
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 6336:
	issue_deauth_ex in disconnect_hdl
drivers/staging/rtl8723bs/core/rtw_cmd.c, 963:
	disconnect_hdl in rtw_disassoc_cmd
drivers/staging/rtl8723bs/core/rtw_mlme.c, 2256:
	rtw_disassoc_cmd in rtw_select_and_join_from_scanned_queue
drivers/staging/rtl8723bs/core/rtw_mlme.c, 2204:
	spin_lock_bh in rtw_select_and_join_from_scanned_queue

To fix this bug, msleep() is replaced with mdelay().

This bug is found by my static analysis tool DSAC.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Jia-Ju Bai 2018-09-15 10:49:28 +08:00 committed by Greg Kroah-Hartman
parent 47bde22970
commit 1c8cb89ee9
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
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@ -3796,7 +3796,7 @@ int issue_deauth_ex(struct adapter *padapter, u8 *da, unsigned short reason, int
break;
if (i < try_cnt && wait_ms > 0 && ret == _FAIL)
msleep(wait_ms);
mdelay(wait_ms);
} while ((i < try_cnt) && ((ret == _FAIL) || (wait_ms == 0)));