linux-kernel - [PATCH v2] rtw_security: fix cast to restricted _

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Date:   Sun, 13 Jun 2021 20:28:58 +0800
From:   Jhih-Ming Huang <fbihjmeric@...il.com>
To:     gregkh@...uxfoundation.org, fabioaiuto83@...il.com,
        ross.schm.dev@...il.com, maqianga@...ontech.com,
        marcocesati@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Jhih-Ming Huang <fbihjmeric@...il.com>
Subject: [PATCH v2] rtw_security: fix cast to restricted __le32

This patch fixes the sparse warning of fix cast to restricted __le32.

Last month, there was a change for replacing private CRC-32 routines with
in-kernel ones.
In that patch, we replaced getcrc32 with crc32_le in calling le32_to_cpu.
le32_to_cpu accepts __le32 type as arg, but crc32_le returns unsigned int.
That how it introduced the sparse warning.

This patch uses __force to fix the warning.

Signed-off-by: Jhih-Ming Huang <fbihjmeric@...il.com>
---
 drivers/staging/rtl8723bs/core/rtw_security.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c
index a99f439328f1..2f4da67e31c6 100644
--- a/drivers/staging/rtl8723bs/core/rtw_security.c
+++ b/drivers/staging/rtl8723bs/core/rtw_security.c
@@ -121,7 +121,7 @@ void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
 		arc4_crypt(ctx, payload, payload,  length);
 
 		/* calculate icv and compare the icv */
-		*((u32 *)crc) = le32_to_cpu(~crc32_le(~0, payload, length - 4));
+		*((u32 *)crc) = le32_to_cpu((__force __le32)~crc32_le(~0, payload, length - 4));
 
 	}
 }
@@ -618,7 +618,8 @@ 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));
+			*((u32 *)crc) = le32_to_cpu((__force __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])
-- 
2.25.1