linux-kernel - [PATCH v3 1/3] staging: rtl8712: fix potential memory leak in r8712_init_drv

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Date:   Wed,  6 Apr 2022 11:54:46 +0800
From:   xkernel.wang@...mail.com
To:     gregkh@...uxfoundation.org
Cc:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v3 1/3] staging: rtl8712: fix potential memory leak in r8712_init_drv_sw()

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

In r8712_init_drv_sw(), there are various error paths do not properly  
release the previous allocated resources but directly return the error  
status, which leads to various memory leaks.

To properly release the resources, this patch unifies the error handler  
of r8712_init_drv_sw().
According to the allocation sequence, if the init function returns 
failure, it will jump to the corresponding error tag.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
ChangeLog:
v1->v2 adjust the sequence of the patches in this series.
v2->v3 update the description.
 drivers/staging/rtl8712/os_intfs.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
index 9502f6a..1f7ccec 100644
--- a/drivers/staging/rtl8712/os_intfs.c
+++ b/drivers/staging/rtl8712/os_intfs.c
@@ -304,10 +304,10 @@ int r8712_init_drv_sw(struct _adapter *padapter)
 	padapter->cmdpriv.padapter = padapter;
 	ret = r8712_init_evt_priv(&padapter->evtpriv);
 	if (ret)
-		return ret;
+		goto free_cmd_priv;
 	ret = r8712_init_mlme_priv(padapter);
 	if (ret)
-		return ret;
+		goto free_evt_priv;
 	_r8712_init_xmit_priv(&padapter->xmitpriv, padapter);
 	_r8712_init_recv_priv(&padapter->recvpriv, padapter);
 	memset((unsigned char *)&padapter->securitypriv, 0,
@@ -316,13 +316,25 @@ int r8712_init_drv_sw(struct _adapter *padapter)
 		    r8712_use_tkipkey_handler, 0);
 	ret = _r8712_init_sta_priv(&padapter->stapriv);
 	if (ret)
-		return ret;
+		goto free_recv_priv;
 	padapter->stapriv.padapter = padapter;
 	r8712_init_bcmc_stainfo(padapter);
 	r8712_init_pwrctrl_priv(padapter);
 	mp871xinit(padapter);
 	init_default_value(padapter);
 	r8712_InitSwLeds(padapter);
+	return 0;
+
+free_recv_priv:
+	_r8712_free_recv_priv(&padapter->recvpriv);
+free_xmit_priv:
+	_free_xmit_priv(&padapter->xmitpriv);
+free_mlme_priv:
+	r8712_free_mlme_priv(&padapter->mlmepriv);
+free_evt_priv:
+	r8712_free_evt_priv(&padapter->evtpriv);
+free_cmd_priv:
+	r8712_free_cmd_priv(&padapter->cmdpriv);
 	return ret;
 }
 
--