linux-kernel - [PATCH v2 2/3] rtl8188eu: Fix a possible sleep-in-atomic bug in rtw_createbss

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Date:   Sun,  8 Oct 2017 19:54:45 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     gregkh@...uxfoundation.org, insafonov@...il.com,
        juliana.orod@...il.com, gs051095@...il.com, jananis37@...il.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH v2 2/3] rtl8188eu: Fix a possible sleep-in-atomic bug in rtw_createbss_cmd

The driver may sleep under a spinlock, and the function call path is:
rtw_surveydone_event_callback(acquire the spinlock)
  rtw_createbss_cmd
    kzalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool and my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 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 9461bce..430b8eb 100644
--- a/drivers/staging/rtl8188eu/core/rtw_cmd.c
+++ b/drivers/staging/rtl8188eu/core/rtw_cmd.c
@@ -333,7 +333,7 @@ u8 rtw_createbss_cmd(struct adapter  *padapter)
 	else
 		RT_TRACE(_module_rtl871x_cmd_c_, _drv_info_, (" createbss for SSid:%s\n", pmlmepriv->assoc_ssid.Ssid));
 
-	pcmd = kzalloc(sizeof(struct cmd_obj), GFP_KERNEL);
+	pcmd = kzalloc(sizeof(struct cmd_obj), GFP_ATOMIC);
 	if (!pcmd) {
 		res = _FAIL;
 		goto exit;
-- 
1.7.9.5