linux-kernel - [PATCH 05/12] staging: rtl8712: add two validation check in r8712_init_drv

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Date:   Tue,  3 May 2022 14:59:49 +0800
From:   xkernel.wang@...mail.com
To:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH 05/12] staging: rtl8712: add two validation check in r8712_init_drv_sw()

From: Xiaoke Wang <xkernel.wang@...mail.com>

_r8712_init_xmit_priv() or _r8712_init_recv_priv() returns -ENOMEM
when some allocations inside it failed.
However, the caller, i.e., r8712_init_drv_sw(), does not properly
validate their return status, which may lead to potential wrong memory
access in the future.

Therefore, this patch adds two validation check for their return status
and properly jump to the corresponding error hanlding code if failures
happen.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
 drivers/staging/rtl8712/os_intfs.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
index 43a7953..3d79d24 100644
--- a/drivers/staging/rtl8712/os_intfs.c
+++ b/drivers/staging/rtl8712/os_intfs.c
@@ -308,8 +308,12 @@ int r8712_init_drv_sw(struct _adapter *padapter)
 	ret = r8712_init_mlme_priv(padapter);
 	if (ret)
 		goto free_evt_priv;
-	_r8712_init_xmit_priv(&padapter->xmitpriv, padapter);
-	_r8712_init_recv_priv(&padapter->recvpriv, padapter);
+	ret = _r8712_init_xmit_priv(&padapter->xmitpriv, padapter);
+	if (ret)
+		goto free_mlme_priv;
+	ret = _r8712_init_recv_priv(&padapter->recvpriv, padapter);
+	if (ret)
+		goto free_xmit_priv;
 	memset((unsigned char *)&padapter->securitypriv, 0,
 	       sizeof(struct security_priv));
 	timer_setup(&padapter->securitypriv.tkip_timer,
--