From: Sven Peter <sven@svenpeter.dev>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Sven Peter <sven@svenpeter.dev>
Subject: [PATCH v2 2/3] usb: typec: tipd: Add an additional overflow check
Date: Tue, 14 Sep 2021 16:02:34 +0200 [thread overview]
Message-ID: <20210914140235.65955-2-sven@svenpeter.dev> (raw)
In-Reply-To: <20210914140235.65955-1-sven@svenpeter.dev>
tps6598x_block_read already checks for the maximum length of the read
but tps6598x_block_write does not. Add the symmetric check there as
well.
Signed-off-by: Sven Peter <sven@svenpeter.dev>
---
v1 -> v2:
- removed the WARN_ON to not crash machines running with panic-on-warn
as pointed out by greg k-h
drivers/usb/typec/tipd/core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index c18ec3785592..8c79ba17a157 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -139,6 +139,9 @@ static int tps6598x_block_write(struct tps6598x *tps, u8 reg,
{
u8 data[TPS_MAX_LEN + 1];
+ if (len + 1 > sizeof(data))
+ return -EINVAL;
+
if (!tps->i2c_protocol)
return regmap_raw_write(tps->regmap, reg, val, len);
--
2.25.1
next prev parent reply other threads:[~2021-09-14 14:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 14:02 [PATCH v2 1/3] usb: typec: tipd: Don't read/write more bytes than required Sven Peter
2021-09-14 14:02 ` Sven Peter [this message]
2021-09-15 7:21 ` [PATCH v2 2/3] usb: typec: tipd: Add an additional overflow check Heikki Krogerus
2021-09-14 14:02 ` [PATCH v2 3/3] usb: typec: tipd: Remove WARN_ON in tps6598x_block_read Sven Peter
2021-09-15 7:23 ` Heikki Krogerus
2021-09-15 7:20 ` [PATCH v2 1/3] usb: typec: tipd: Don't read/write more bytes than required Heikki Krogerus
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