staging: r8188eu: add check for kzalloc

[ Upstream commit f94b47c6bde624d6c07f43054087607c52054a95 ]

As kzalloc() may return null pointer, it should be better to
check the return value and return error if fails in order
to avoid dereference of null pointer.
Moreover, the return value of rtw_alloc_hwxmits() should also
be dealt with.

Fixes: 15865124feed ("staging: r8188eu: introduce new core dir for RTL8188eu driver")
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220518075957.514603-1-jiasheng@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
index 46fe62c7c32ceb60e03e398355428d5390d36baa..0ee4f88a60d44e3fa010ce6e1293705cf0986f3b 100644 (file)
--- a/drivers/staging/r8188eu/core/rtw_xmit.c
+++ b/drivers/staging/r8188eu/core/rtw_xmit.c
@@ -179,7 +179,12 @@ s32        _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
        pxmitpriv->free_xmit_extbuf_cnt = num_xmit_extbuf;
 
-       rtw_alloc_hwxmits(padapter);
+       res = rtw_alloc_hwxmits(padapter);
+       if (res) {
+               res = _FAIL;
+               goto exit;
+       }
+
        rtw_init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
 
        for (i = 0; i < 4; i++)
@@ -1516,7 +1521,7 @@ exit:
        return res;
 }
 
-void rtw_alloc_hwxmits(struct adapter *padapter)
+int rtw_alloc_hwxmits(struct adapter *padapter)
 {
        struct hw_xmit *hwxmits;
        struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
@@ -1524,6 +1529,8 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
        pxmitpriv->hwxmit_entry = HWXMIT_ENTRY;
 
        pxmitpriv->hwxmits = kzalloc(sizeof(struct hw_xmit) * pxmitpriv->hwxmit_entry, GFP_KERNEL);
+       if (!pxmitpriv->hwxmits)
+               return -ENOMEM;
 
        hwxmits = pxmitpriv->hwxmits;
 
@@ -1540,6 +1547,8 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
                hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
        } else {
        }
+
+       return 0;
 }
 
 void rtw_free_hwxmits(struct adapter *padapter)

diff --git a/drivers/staging/r8188eu/include/rtw_xmit.h b/drivers/staging/r8188eu/include/rtw_xmit.h
index 5f6e2402e5c4d5860e6535c0e5462596442e2bec..762a2fa3bd17ce6d30437fb0254fe3fbc76bb557 100644 (file)
--- a/drivers/staging/r8188eu/include/rtw_xmit.h
+++ b/drivers/staging/r8188eu/include/rtw_xmit.h
@@ -345,7 +345,7 @@ s32 rtw_txframes_sta_ac_pending(struct adapter *padapter,
 void rtw_init_hwxmits(struct hw_xmit *phwxmit, int entry);
 s32 _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter);
 void _rtw_free_xmit_priv(struct xmit_priv *pxmitpriv);
-void rtw_alloc_hwxmits(struct adapter *padapter);
+int rtw_alloc_hwxmits(struct adapter *padapter);
 void rtw_free_hwxmits(struct adapter *padapter);
 s32 rtw_xmit(struct adapter *padapter, struct sk_buff **pkt);