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Subject[PATCH 4.19 028/148] ieee802154: ca8210: fix possible u8 overflow in ca8210_rx_done
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 8e41cae64b08fe2e86a9ffb88b295c6b4b3a3322 ]

gcc warning this:

drivers/net/ieee802154/ca8210.c:730:10: warning:
comparison is always false due to limited range of data type [-Wtype-limits]

'len' is u8 type, we get it from buf[1] adding 2, which can overflow.
This patch change the type of 'len' to unsigned int to avoid this,also fix
the gcc warning.

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ieee802154/ca8210.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 0ff5a403a8dc..b2ff903a9cb6 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -721,7 +721,7 @@ static void ca8210_mlme_reset_worker(struct work_struct *work)
static void ca8210_rx_done(struct cas_control *cas_ctl)
{
u8 *buf;
- u8 len;
+ unsigned int len;
struct work_priv_container *mlme_reset_wpc;
struct ca8210_priv *priv = cas_ctl->priv;

@@ -730,7 +730,7 @@ static void ca8210_rx_done(struct cas_control *cas_ctl)
if (len > CA8210_SPI_BUF_SIZE) {
dev_crit(
&priv->spi->dev,
- "Received packet len (%d) erroneously long\n",
+ "Received packet len (%u) erroneously long\n",
len
);
goto finish;
--
2.19.1


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