linux-kernel - [PATCH v2 3/3] usb: typec: tipd: Remove WARN_ON in tps6598x_block

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Date:   Tue, 14 Sep 2021 16:02:35 +0200
From:   Sven Peter <sven@...npeter.dev>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sven Peter <sven@...npeter.dev>
Subject: [PATCH v2 3/3] usb: typec: tipd: Remove WARN_ON in tps6598x_block_read

Calling tps6598x_block_read with a higher than allowed len can be
handled by just returning an error. There's no need to crash systems
with panic-on-warn enabled.

Signed-off-by: Sven Peter <sven@...npeter.dev>
---
v1 -> v2:
 - added this patch to also remove the WARN_ON in tps6598x_block_read
   as suggested by greg k-h

 drivers/usb/typec/tipd/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 8c79ba17a157..93e56291f0cf 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -117,7 +117,7 @@ tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
 	u8 data[TPS_MAX_LEN + 1];
 	int ret;
 
-	if (WARN_ON(len + 1 > sizeof(data)))
+	if (len + 1 > sizeof(data))
 		return -EINVAL;
 
 	if (!tps->i2c_protocol)
-- 
2.25.1