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From: trix@redhat.com
To: michael.hennerich@analog.com, alex.aring@gmail.com,
	stefan@datenfreihafen.org, davem@davemloft.net, kuba@kernel.org,
	marcel@holtmann.org
Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, Tom Rix <trix@redhat.com>
Subject: [PATCH] ieee802154/adf7242: check status of adf7242_read_reg
Date: Sun,  2 Aug 2020 07:23:39 -0700
Message-ID: <20200802142339.21091-1-trix@redhat.com> (raw)

From: Tom Rix <trix@redhat.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@redhat.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


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-02 14:23 trix [this message]
2020-08-03  6:20 ` Hennerich, Michael
2020-08-03 18:27 ` Stefan Schmidt

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