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authorAnant Thazhemadam <anant.thazhemadam@gmail.com>2020-10-10 11:29:32 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-10-10 13:37:46 +0300
commite1f13c879a7c21bd207dc6242455e8e3a1e88b40 (patch)
treea7d021c3405843c881b206028057802b1ad04c5e /drivers/staging
parent868fd970e187d39c586565c875837e530c6f7e1b (diff)
downloadlinux-e1f13c879a7c21bd207dc6242455e8e3a1e88b40.tar.xz
staging: comedi: check validity of wMaxPacketSize of usb endpoints found
While finding usb endpoints in vmk80xx_find_usb_endpoints(), check if wMaxPacketSize = 0 for the endpoints found. Some devices have isochronous endpoints that have wMaxPacketSize = 0 (as required by the USB-2 spec). However, since this doesn't apply here, wMaxPacketSize = 0 can be considered to be invalid. Reported-by: syzbot+009f546aa1370056b1c2@syzkaller.appspotmail.com Tested-by: syzbot+009f546aa1370056b1c2@syzkaller.appspotmail.com Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20201010082933.5417-1-anant.thazhemadam@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/comedi/drivers/vmk80xx.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/vmk80xx.c b/drivers/staging/comedi/drivers/vmk80xx.c
index 65dc6c51037e..7956abcbae22 100644
--- a/drivers/staging/comedi/drivers/vmk80xx.c
+++ b/drivers/staging/comedi/drivers/vmk80xx.c
@@ -667,6 +667,9 @@ static int vmk80xx_find_usb_endpoints(struct comedi_device *dev)
if (!devpriv->ep_rx || !devpriv->ep_tx)
return -ENODEV;
+ if (!usb_endpoint_maxp(devpriv->ep_rx) || !usb_endpoint_maxp(devpriv->ep_tx))
+ return -EINVAL;
+
return 0;
}