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Date: Tue, 31 Mar 2020 10:59:41 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Qiujun Huang <hqjagain@...il.com>, Johan Hovold <johan@...nel.org>, syzbot+37ba33391ad5f3935bbd@...kaller.appspotmail.com Subject: [PATCH 5.4 141/155] USB: serial: io_edgeport: fix slab-out-of-bounds read in edge_interrupt_callback From: Qiujun Huang <hqjagain@...il.com> commit 57aa9f294b09463492f604feaa5cc719beaace32 upstream. 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@...kaller.appspotmail.com Signed-off-by: Qiujun Huang <hqjagain@...il.com> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable <stable@...r.kernel.org> Signed-off-by: Johan Hovold <johan@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/usb/serial/io_edgeport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -710,7 +710,7 @@ static void edge_interrupt_callback(stru /* 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) {
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