Re: [PATCH] ieee802154/adf7242: check status of adf7242_read_reg

From: Stefan Schmidt
Date: Mon Aug 03 2020 - 14:27:33 EST


On 02.08.20 16:23, trix@xxxxxxxxxx wrote:
From: Tom Rix <trix@xxxxxxxxxx>

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@xxxxxxxxxx>
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;

This patch has been applied to the wpan tree and will be
part of the next pull request to net. Thanks!

Stefan Schmidt