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[36.229.229.123]) by smtp.gmail.com with ESMTPSA id ge24sm4252254pjb.18.2021.06.21.08.51.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 08:51:08 -0700 (PDT) Date: Mon, 21 Jun 2021 23:51:04 +0800 From: Jhih-Ming Huang To: gregkh@linuxfoundation.org, fabioaiuto83@gmail.com, ross.schm.dev@gmail.com, maqianga@uniontech.com, marcocesati@gmail.com, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5] rtw_security: fix cast to restricted __le32 Message-ID: <20210621155104.6w237avwjto3vysi@gmail.com> References: <20210619075255.107807-1-fbihjmeric@gmail.com> <20210621081928.145203-1-fbihjmeric@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210621081928.145203-1-fbihjmeric@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 21, 2021 at 04:19:28PM +0800, Jhih-Ming Huang wrote: > This patch fixes the sparse warning of fix cast to restricted __le32. > > There was a change for replacing private CRC-32 routines with in kernel > ones. > However, the author used le32_to_cpu to convert crc32_le(), and we > should cpu_to_le32. > > Ths commit also fixes the payload checking by memcmp instead of checking element > by element and removes the unused variable. > > Signed-off-by: Jhih-Ming Huang I forgot to add the Reported-by tag. already added in PATCH v6 thanks. jmhuang > --- > drivers/staging/rtl8723bs/core/rtw_security.c | 12 +++--------- > 1 file changed, 3 insertions(+), 9 deletions(-) > > diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c > index a99f439328f1..8dc6a976b487 100644 > --- a/drivers/staging/rtl8723bs/core/rtw_security.c > +++ b/drivers/staging/rtl8723bs/core/rtw_security.c > @@ -92,7 +92,6 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe) > void rtw_wep_decrypt(struct adapter *padapter, u8 *precvframe) > { > /* exclude ICV */ > - u8 crc[4]; > signed int length; > u32 keylength; > u8 *pframe, *payload, *iv, wepkey[16]; > @@ -119,10 +118,6 @@ void rtw_wep_decrypt(struct adapter *padapter, u8 *precvframe) > /* decrypt payload include icv */ > arc4_setkey(ctx, wepkey, 3 + keylength); > arc4_crypt(ctx, payload, payload, length); > - > - /* calculate icv and compare the icv */ > - *((u32 *)crc) = le32_to_cpu(~crc32_le(~0, payload, length - 4)); > - > } > } > > @@ -537,7 +532,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe) > u32 pnh; > u8 rc4key[16]; > u8 ttkey[16]; > - u8 crc[4]; > + __le32 crc; > signed int length; > > u8 *pframe, *payload, *iv, *prwskey; > @@ -618,10 +613,9 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe) > arc4_setkey(ctx, rc4key, 16); > arc4_crypt(ctx, payload, payload, length); > > - *((u32 *)crc) = le32_to_cpu(~crc32_le(~0, payload, length - 4)); > + crc = cpu_to_le32(~crc32_le(~0, payload, length - 4)); > > - if (crc[3] != payload[length - 1] || crc[2] != payload[length - 2] || > - crc[1] != payload[length - 3] || crc[0] != payload[length - 4]) > + if (memcmp(&crc, payload + length - 4, 4) != 0) > res = _FAIL; > } else { > res = _FAIL; > -- > 2.32.0 >