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Message-ID: <15d1e6c7-01c7-bff6-59de-1dcafb9af082@codeaurora.org>
Date: Thu, 21 Mar 2019 01:50:50 +0530
From: Mukesh Ojha <mojha@...eaurora.org>
To: Aditya Pakki <pakki001@....edu>
Cc: kjlu@....edu, Larry Finger <Larry.Finger@...inger.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michael Straube <straube.linux@...il.com>,
Colin Ian King <colin.king@...onical.com>,
Hardik Singh Rathore <hardiksingh.k@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <natechancellor@...il.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: rtl8188eu: Fix potential NULL pointer
dereference of kcalloc
On 3/20/2019 10:51 PM, Aditya Pakki wrote:
> hwxmits is allocated via kcalloc and not checked for failure before its
No need to mention kcalloc as the other place allocates the memory
through kmalloc.
Otherwise looks good.
Acked-by: Mukesh Ojha <mojha@...eaurora.org>
> dereference. The patch fixes this problem by returning error upstream
> in rtl8723bs, rtl8188eu.
>
> Signed-off-by: Aditya Pakki <pakki001@....edu>
>
> ---
> v2: Move signed off above version change log.
> v1: Return error and remove print in case of failure, per Greg
> ---
> drivers/staging/rtl8188eu/core/rtw_xmit.c | 9 +++++++--
> drivers/staging/rtl8188eu/include/rtw_xmit.h | 2 +-
> drivers/staging/rtl8723bs/core/rtw_xmit.c | 14 +++++++-------
> drivers/staging/rtl8723bs/include/rtw_xmit.h | 2 +-
> 4 files changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/staging/rtl8188eu/core/rtw_xmit.c b/drivers/staging/rtl8188eu/core/rtw_xmit.c
> index 1723a47a96b4..952f2ab51347 100644
> --- a/drivers/staging/rtl8188eu/core/rtw_xmit.c
> +++ b/drivers/staging/rtl8188eu/core/rtw_xmit.c
> @@ -174,7 +174,9 @@ 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 == _FAIL)
> + goto exit;
> rtw_init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
>
> for (i = 0; i < 4; i++)
> @@ -1503,7 +1505,7 @@ s32 rtw_xmit_classifier(struct adapter *padapter, struct xmit_frame *pxmitframe)
> return res;
> }
>
> -void rtw_alloc_hwxmits(struct adapter *padapter)
> +s32 rtw_alloc_hwxmits(struct adapter *padapter)
> {
> struct hw_xmit *hwxmits;
> struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
> @@ -1512,6 +1514,8 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
>
> pxmitpriv->hwxmits = kcalloc(pxmitpriv->hwxmit_entry,
> sizeof(struct hw_xmit), GFP_KERNEL);
> + if (!pxmitpriv->hwxmits)
> + return _FAIL;
>
> hwxmits = pxmitpriv->hwxmits;
>
> @@ -1519,6 +1523,7 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
> hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
> hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
> hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
> + return _SUCCESS;
> }
>
> void rtw_free_hwxmits(struct adapter *padapter)
> diff --git a/drivers/staging/rtl8188eu/include/rtw_xmit.h b/drivers/staging/rtl8188eu/include/rtw_xmit.h
> index 788f59c74ea1..ba7e15fbde72 100644
> --- a/drivers/staging/rtl8188eu/include/rtw_xmit.h
> +++ b/drivers/staging/rtl8188eu/include/rtw_xmit.h
> @@ -336,7 +336,7 @@ 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);
> +s32 rtw_alloc_hwxmits(struct adapter *padapter);
> void rtw_free_hwxmits(struct adapter *padapter);
> s32 rtw_xmit(struct adapter *padapter, struct sk_buff **pkt);
>
> diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> index 094d61bcb469..b87f13a0b563 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_xmit.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> @@ -260,7 +260,9 @@ s32 _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
> }
> }
>
> - rtw_alloc_hwxmits(padapter);
> + res = rtw_alloc_hwxmits(padapter);
> + if (res == _FAIL)
> + goto exit;
> rtw_init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
>
> for (i = 0; i < 4; i++) {
> @@ -2144,7 +2146,7 @@ s32 rtw_xmit_classifier(struct adapter *padapter, struct xmit_frame *pxmitframe)
> return res;
> }
>
> -void rtw_alloc_hwxmits(struct adapter *padapter)
> +s32 rtw_alloc_hwxmits(struct adapter *padapter)
> {
> struct hw_xmit *hwxmits;
> struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
> @@ -2155,10 +2157,8 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
>
> pxmitpriv->hwxmits = rtw_zmalloc(sizeof(struct hw_xmit) * pxmitpriv->hwxmit_entry);
>
> - if (pxmitpriv->hwxmits == NULL) {
> - DBG_871X("alloc hwxmits fail!...\n");
> - return;
> - }
> + if (!pxmitpriv->hwxmits)
> + return _FAIL;
>
> hwxmits = pxmitpriv->hwxmits;
>
> @@ -2204,7 +2204,7 @@ void rtw_alloc_hwxmits(struct adapter *padapter)
>
> }
>
> -
> + return _SUCCESS;
> }
>
> void rtw_free_hwxmits(struct adapter *padapter)
> diff --git a/drivers/staging/rtl8723bs/include/rtw_xmit.h b/drivers/staging/rtl8723bs/include/rtw_xmit.h
> index 1b38b9182b31..37f42b2f22f1 100644
> --- a/drivers/staging/rtl8723bs/include/rtw_xmit.h
> +++ b/drivers/staging/rtl8723bs/include/rtw_xmit.h
> @@ -487,7 +487,7 @@ 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);
> +s32 rtw_alloc_hwxmits(struct adapter *padapter);
> void rtw_free_hwxmits(struct adapter *padapter);
>
>
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