linux-kernel - [PATCH 4.9 106/121] ieee802154/adf7242: check status of adf7242_read

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Date:   Tue, 29 Sep 2020 13:00:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tom Rix <trix@...hat.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 106/121] ieee802154/adf7242: check status of adf7242_read_reg

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

[ Upstream commit e3914ed6cf44bfe1f169e26241f8314556fd1ac1 ]

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>
Acked-by: Michael Hennerich <michael.hennerich@...log.com>
Link: https://lore.kernel.org/r/20200802142339.21091-1-trix@redhat.com
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1b980f12663af..a605dfb15bb75 100644
--- a/drivers/net/ieee802154/adf7242.c
+++ b/drivers/net/ieee802154/adf7242.c
@@ -834,7 +834,9 @@ 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;
 
-- 
2.25.1