From: Qiujun Huang <hqjagain@gmail.com>
To: johan@kernel.org, gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
anenbupt@gmail.com, Qiujun Huang <hqjagain@gmail.com>
Subject: [PATCH] USB: io_edgeport: fix slab-out-of-bounds Read in edge_interrupt_callback
Date: Wed, 25 Mar 2020 15:52:37 +0800 [thread overview]
Message-ID: <1585122757-4528-1-git-send-email-hqjagain@gmail.com> (raw)
The boundary condition should be (length - 1) as we access data[position+1].
Reported-and-tested-by: syzbot+37ba33391ad5f3935bbd@syzkaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
---
drivers/usb/serial/io_edgeport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 5737add..4cca0b8 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -710,7 +710,7 @@ static void edge_interrupt_callback(struct urb *urb)
/* grab the txcredits for the ports if available */
position = 2;
portNumber = 0;
- while ((position < length) &&
+ while ((position < length - 1) &&
(portNumber < edge_serial->serial->num_ports)) {
txCredits = data[position] | (data[position+1] << 8);
if (txCredits) {
--
1.8.3.1
next reply other threads:[~2020-03-25 7:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 7:52 Qiujun Huang [this message]
2020-03-26 8:14 ` [PATCH] USB: io_edgeport: fix slab-out-of-bounds Read in edge_interrupt_callback Greg KH
2020-03-26 8:21 ` Johan Hovold
2020-03-26 9:13 ` Johan Hovold
2020-03-26 9:29 ` Greg KH
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