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Message-ID: <229ce731-9c2f-1718-b59e-3960d4e81556@lwfinger.net>
Date: Mon, 10 Apr 2017 10:54:39 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: Aishwarya Pant <aishpant@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Bastien Nocera <hadess@...ess.net>,
Hans de Goede <hdegoede@...hat.com>
Cc: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723bs: remove null test before kfree
On 04/10/2017 08:43 AM, Aishwarya Pant wrote:
> kfree(..) on a NULL pointer is a no-op; the null test here is redundant.
> Detected by coccicheck.
>
> Signed-off-by: Aishwarya Pant <aishpant@...il.com>
Acked-by: Larry Finger <Larry.Finger@...inger.net>
Thanks,
Larry
> ---
> drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c | 6 ++----
> drivers/staging/rtl8723bs/hal/sdio_ops.c | 6 ++----
> drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 8 ++-----
> drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 26 ++++++-----------------
> drivers/staging/rtl8723bs/os_dep/xmit_linux.c | 6 ++----
> 5 files changed, 15 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c b/drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c
> index d40ad03..910f7fa 100644
> --- a/drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c
> +++ b/drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c
> @@ -995,8 +995,7 @@ if (1) {
> rtw_hal_set_hwreg(padapter, HW_VAR_EFUSE_USAGE, (u8 *)&efuse_usage);
> }
>
> - if (efuseTbl)
> - kfree(efuseTbl);
> + kfree(efuseTbl);
> }
>
> static void hal_ReadEFuse_BT(
> @@ -1128,8 +1127,7 @@ static void hal_ReadEFuse_BT(
> }
>
> exit:
> - if (efuseTbl)
> - kfree(efuseTbl);
> + kfree(efuseTbl);
> }
>
> static void Hal_ReadEFuse(
> diff --git a/drivers/staging/rtl8723bs/hal/sdio_ops.c b/drivers/staging/rtl8723bs/hal/sdio_ops.c
> index cf09a0a..6285b72 100644
> --- a/drivers/staging/rtl8723bs/hal/sdio_ops.c
> +++ b/drivers/staging/rtl8723bs/hal/sdio_ops.c
> @@ -602,8 +602,7 @@ static s32 _sdio_local_read(
> if (!err)
> memcpy(pbuf, ptmpbuf, cnt);
>
> - if (ptmpbuf)
> - kfree(ptmpbuf);
> + kfree(ptmpbuf);
>
> return err;
> }
> @@ -646,8 +645,7 @@ s32 sdio_local_read(
> if (!err)
> memcpy(pbuf, ptmpbuf, cnt);
>
> - if (ptmpbuf)
> - kfree(ptmpbuf);
> + kfree(ptmpbuf);
>
> return err;
> }
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> index d2c6604..52aa65b 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> @@ -1170,10 +1170,7 @@ static int cfg80211_rtw_add_key(struct wiphy *wiphy, struct net_device *ndev,
> }
>
> addkey_end:
> - if (param)
> - {
> - kfree((u8 *)param);
> - }
> + kfree((u8 *)param);
>
> return ret;
>
> @@ -1968,8 +1965,7 @@ static int rtw_cfg80211_set_wpa_ie(struct adapter *padapter, u8 *pie, size_t iel
> pairwise_cipher, padapter->securitypriv.ndisencryptstatus, padapter->securitypriv.ndisauthtype));
>
> exit:
> - if (buf)
> - kfree(buf);
> + kfree(buf);
> if (ret)
> _clr_fwstate_(&padapter->mlmepriv, WIFI_UNDER_WPS);
> return ret;
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> index fe3c42a..e11045f 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> @@ -766,9 +766,7 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
>
> exit:
>
> - if (pwep) {
> - kfree((u8 *)pwep);
> - }
> + kfree((u8 *)pwep);
> return ret;
> }
>
> @@ -926,7 +924,7 @@ static int rtw_set_wpa_ie(struct adapter *padapter, char *pie, unsigned short ie
>
> exit:
>
> - if (buf) kfree(buf);
> + kfree(buf);
>
> return ret;
> }
> @@ -2502,10 +2500,7 @@ static int rtw_wx_set_enc_ext(struct net_device *dev,
> ret = wpa_set_encryption(dev, param, param_len);
>
> exit:
> - if (param)
> - {
> - kfree((u8 *)param);
> - }
> + kfree((u8 *)param);
>
> return ret;
> }
> @@ -4135,11 +4130,7 @@ static int rtw_set_encryption(struct net_device *dev, struct ieee_param *param,
> }
>
> exit:
> -
> - if (pwep)
> - {
> - kfree((u8 *)pwep);
> - }
> + kfree((u8 *)pwep);
>
> return ret;
>
> @@ -5785,12 +5776,9 @@ static int rtw_ioctl_wext_private(struct net_device *dev, union iwreq_data *wrq_
> }
>
> exit:
> - if (input)
> - kfree(input);
> - if (buffer)
> - kfree(buffer);
> - if (output)
> - kfree(output);
> + kfree(input);
> + kfree(buffer);
> + kfree(output);
>
> return err;
> }
> diff --git a/drivers/staging/rtl8723bs/os_dep/xmit_linux.c b/drivers/staging/rtl8723bs/os_dep/xmit_linux.c
> index 66dfec1..7696816 100644
> --- a/drivers/staging/rtl8723bs/os_dep/xmit_linux.c
> +++ b/drivers/staging/rtl8723bs/os_dep/xmit_linux.c
> @@ -76,10 +76,8 @@ int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitb
>
> void rtw_os_xmit_resource_free(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 free_sz, u8 flag)
> {
> - if (free_sz > 0) {
> - if (pxmitbuf->pallocated_buf)
> - kfree(pxmitbuf->pallocated_buf);
> - }
> + if (free_sz > 0)
> + kfree(pxmitbuf->pallocated_buf);
> }
>
> #define WMM_XMIT_THRESHOLD (NR_XMITFRAME*2/5)
>
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