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[36.229.229.123]) by smtp.gmail.com with ESMTPSA id u1sm14384584pfu.160.2021.06.21.01.19.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 01:19:43 -0700 (PDT) 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 Cc: Jhih-Ming Huang Subject: [PATCH v5] rtw_security: fix cast to restricted __le32 Date: Mon, 21 Jun 2021 16:19:28 +0800 Message-Id: <20210621081928.145203-1-fbihjmeric@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210619075255.107807-1-fbihjmeric@gmail.com> References: <20210619075255.107807-1-fbihjmeric@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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