Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Sun, 11 Nov 2018 19:49:05 +0000 | Subject | [PATCH 3.16 335/366] usbip: stub_rx: fix static checker warning on unnecessary checks |
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3.16.61-rc1 review patch. If anyone has any objections, please let me know.
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From: Shuah Khan <shuahkh@osg.samsung.com>
commit 10c90120930628e8b959bf58d4a0aaef3ae5d945 upstream.
Fix the following static checker warnings:
The patch c6688ef9f297: "usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input" from Dec 7, 2017, leads to the following static checker warning:
drivers/usb/usbip/stub_rx.c:346 get_pipe() warn: impossible condition '(pdu->u.cmd_submit.transfer_buffer_length > ((~0 >> 1))) => (s32min-s32max > s32max)' drivers/usb/usbip/stub_rx.c:486 stub_recv_cmd_submit() warn: always true condition '(pdu->u.cmd_submit.transfer_buffer_length <= ((~0 >> 1))) => (s32min-s32max <= s32max)'
Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/staging/usbip/stub_rx.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-)
--- a/drivers/staging/usbip/stub_rx.c +++ b/drivers/staging/usbip/stub_rx.c @@ -353,14 +353,6 @@ static int get_pipe(struct stub_device * epd = &ep->desc; - /* validate transfer_buffer_length */ - if (pdu->u.cmd_submit.transfer_buffer_length > INT_MAX) { - dev_err(&sdev->udev->dev, - "CMD_SUBMIT: -EMSGSIZE transfer_buffer_length %d\n", - pdu->u.cmd_submit.transfer_buffer_length); - return -1; - } - if (usb_endpoint_xfer_control(epd)) { if (dir == USBIP_DIR_OUT) return usb_sndctrlpipe(udev, epnum); @@ -494,8 +486,7 @@ static void stub_recv_cmd_submit(struct } /* allocate urb transfer buffer, if needed */ - if (pdu->u.cmd_submit.transfer_buffer_length > 0 && - pdu->u.cmd_submit.transfer_buffer_length <= INT_MAX) { + if (pdu->u.cmd_submit.transfer_buffer_length > 0) { priv->urb->transfer_buffer = kzalloc(pdu->u.cmd_submit.transfer_buffer_length, GFP_KERNEL);
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