linux-kernel - [PATCH] ieee802154/adf7242: check status of adf7242_read

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Date:   Sun,  2 Aug 2020 07:23:39 -0700
From:   trix@...hat.com
To:     michael.hennerich@...log.com, alex.aring@...il.com,
        stefan@...enfreihafen.org, davem@...emloft.net, kuba@...nel.org,
        marcel@...tmann.org
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] ieee802154/adf7242: check status of adf7242_read_reg

From: Tom Rix <trix@...hat.com>

Clang static analysis reports this error

adf7242.c:887:6: warning: Assigned value is garbage or undefined
        len = len_u8;
            ^ ~~~~~~

len_u8 is set in
       adf7242_read_reg(lp, 0, &len_u8);

When this call fails, len_u8 is not set.

So check the return code.

Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154")

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/net/ieee802154/adf7242.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
index c11f32f644db..7db9cbd0f5de 100644
--- a/drivers/net/ieee802154/adf7242.c
+++ b/drivers/net/ieee802154/adf7242.c
@@ -882,7 +882,9 @@ static int adf7242_rx(struct adf7242_local *lp)
 	int ret;
 	u8 lqi, len_u8, *data;
 
-	adf7242_read_reg(lp, 0, &len_u8);
+	ret = adf7242_read_reg(lp, 0, &len_u8);
+	if (ret)
+		return ret;
 
 	len = len_u8;
 
-- 
2.18.1