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USB: serial: io_edgeport: fix slab-out-of-bounds read in edge_interrupt_callback

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Fix slab-out-of-bounds read in the interrupt-URB completion handler.

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>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Qiujun Huang 2020-03-25 15:52:37 +08:00 committed by Johan Hovold
parent dfee7e2f47
commit 57aa9f294b
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/io_edgeport.c
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@ -710,7 +710,7 @@ static void edge_interrupt_callback(struct urb *urb)
/* grab the txcredits for the ports if available */ /* grab the txcredits for the ports if available */
position = 2; position = 2;
portNumber = 0; portNumber = 0;
while ((position < length) && while ((position < length - 1) &&
(portNumber < edge_serial->serial->num_ports)) { (portNumber < edge_serial->serial->num_ports)) {
txCredits = data[position] | (data[position+1] << 8); txCredits = data[position] | (data[position+1] << 8);
if (txCredits) { if (txCredits) {