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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Alan Stern <stern@rowland.harvard.edu>,
        Johan Hovold <johan@kernel.org>,
        syzbot+7dbcd9ff34dc4ed45240@syzkaller.appspotmail.com,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sasha Levin <sashal@kernel.org>, linux-usb@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 20/39] USB: core: Avoid WARNings for 0-length descriptor requests
Date:   Fri,  9 Jul 2021 22:31:45 -0400
Message-Id: <20210710023204.3171428-20-sashal@kernel.org>
In-Reply-To: <20210710023204.3171428-1-sashal@kernel.org>
References: <20210710023204.3171428-1-sashal@kernel.org>
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From: Alan Stern <stern@rowland.harvard.edu>

[ Upstream commit 60dfe484cef45293e631b3a6e8995f1689818172 ]

The USB core has utility routines to retrieve various types of
descriptors.  These routines will now provoke a WARN if they are asked
to retrieve 0 bytes (USB "receive" requests must not have zero
length), so avert this by checking the size argument at the start.

CC: Johan Hovold <johan@kernel.org>
Reported-and-tested-by: syzbot+7dbcd9ff34dc4ed45240@syzkaller.appspotmail.com
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210607152307.GD1768031@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/core/message.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 152228d33ad2..2d1012d4bb33 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -647,6 +647,9 @@ int usb_get_descriptor(struct usb_device *dev, unsigned char type,
 	int i;
 	int result;
 
+	if (size <= 0)		/* No point in asking for no data */
+		return -EINVAL;
+
 	memset(buf, 0, size);	/* Make sure we parse really received data */
 
 	for (i = 0; i < 3; ++i) {
@@ -695,6 +698,9 @@ static int usb_get_string(struct usb_device *dev, unsigned short langid,
 	int i;
 	int result;
 
+	if (size <= 0)		/* No point in asking for no data */
+		return -EINVAL;
+
 	for (i = 0; i < 3; ++i) {
 		/* retry on length 0 or stall; some devices are flakey */
 		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-- 
2.30.2