linux-kernel - [PATCH 4.20 04/57] staging: rtl8188eu: Fix module loading from tasklet for CCMP encryption

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Date:   Tue, 15 Jan 2019 17:35:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ivan Safonov <insafonov@...il.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Michael Straube <straube.linux@...il.com>
Subject: [PATCH 4.20 04/57] staging: rtl8188eu: Fix module loading from tasklet for CCMP encryption

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@...inger.net>

commit 84cad97a717f5749a0236abd5ce68da582ea074f upstream.

Commit 6bd082af7e36 ("staging:r8188eu: use lib80211 CCMP decrypt")
causes scheduling while atomic bugs followed by a hard freeze whenever
the driver tries to connect to a CCMP-encrypted network. Experimentation
showed that the freezes were eliminated when module lib80211 was
preloaded, which can be forced by calling lib80211_get_crypto_ops()
directly rather than indirectly through try_then_request_module().
With this change, no BUG messages are logged.

Fixes: 6bd082af7e36 ("staging:r8188eu: use lib80211 CCMP decrypt")
Cc: Stable <stable@...r.kernel.org> # v4.17+
Reported-and-tested-by: Michael Straube <straube.linux@...il.com>
Cc: Ivan Safonov <insafonov@...il.com>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/rtl8188eu/core/rtw_security.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -1291,7 +1291,7 @@ u32 rtw_aes_decrypt(struct adapter *pada
 			struct sk_buff *skb = ((struct recv_frame *)precvframe)->pkt;
 			void *crypto_private = NULL;
 			u8 *key, *pframe = skb->data;
-			struct lib80211_crypto_ops *crypto_ops = try_then_request_module(lib80211_get_crypto_ops("CCMP"), "lib80211_crypt_ccmp");
+			struct lib80211_crypto_ops *crypto_ops = lib80211_get_crypto_ops("CCMP");
 			struct security_priv *psecuritypriv = &padapter->securitypriv;
 			char iv[8], icv[8];