From: Johan Hovold <johan@kernel.org>
To: Wolfram Sang <wsa@kernel.org>
Cc: linux-i2c@vger.kernel.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, Johan Hovold <johan@kernel.org>,
syzbot+9d7dadd15b8819d73f41@syzkaller.appspotmail.com,
stable@vger.kernel.org, Andrew Lunn <andrew@lunn.ch>
Subject: [PATCH] i2c: robotfuzz-osif: fix control-request directions
Date: Mon, 24 May 2021 11:09:12 +0200 [thread overview]
Message-ID: <20210524090912.3989-1-johan@kernel.org> (raw)
The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.
Control transfers without a data stage are treated as OUT requests by
the USB stack and should be using usb_sndctrlpipe(). Failing to do so
will now trigger a warning.
Fix the OSIFI2C_SET_BIT_RATE and OSIFI2C_STOP requests which erroneously
used the osif_usb_read() helper and set the IN direction bit.
Reported-by: syzbot+9d7dadd15b8819d73f41@syzkaller.appspotmail.com
Fixes: 83e53a8f120f ("i2c: Add bus driver for for OSIF USB i2c device.")
Cc: stable@vger.kernel.org # 3.14
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/i2c/busses/i2c-robotfuzz-osif.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-robotfuzz-osif.c b/drivers/i2c/busses/i2c-robotfuzz-osif.c
index a39f7d092797..66dfa211e736 100644
--- a/drivers/i2c/busses/i2c-robotfuzz-osif.c
+++ b/drivers/i2c/busses/i2c-robotfuzz-osif.c
@@ -83,7 +83,7 @@ static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
}
}
- ret = osif_usb_read(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
+ ret = osif_usb_write(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
if (ret) {
dev_err(&adapter->dev, "failure sending STOP\n");
return -EREMOTEIO;
@@ -153,7 +153,7 @@ static int osif_probe(struct usb_interface *interface,
* Set bus frequency. The frequency is:
* 120,000,000 / ( 16 + 2 * div * 4^prescale).
* Using dev = 52, prescale = 0 give 100KHz */
- ret = osif_usb_read(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
+ ret = osif_usb_write(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
NULL, 0);
if (ret) {
dev_err(&interface->dev, "failure sending bit rate");
--
2.26.3
next reply other threads:[~2021-05-24 9:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-24 9:09 Johan Hovold [this message]
2021-06-23 8:52 ` [PATCH] i2c: robotfuzz-osif: fix control-request directions Johan Hovold
2021-06-24 20:10 ` Wolfram Sang
2021-06-24 20:32 ` Andrew Lunn
2021-06-25 12:47 ` Johan Hovold
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