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USB: legousbtower: fix slab info leak at probe 

Make sure to check for short transfers when retrieving the version
information at probe to avoid leaking uninitialised slab data when
logging it.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20190919083039.30898-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Johan Hovold 2019-09-19 10:30:36 +02:00 committed by Greg Kroah-Hartman
parent f2372b87c3
commit 1d427be4a3
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/misc/legousbtower.c
View File

@ -891,8 +891,10 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device
get_version_reply,
sizeof(*get_version_reply),
1000);
if (result < 0) {
dev_err(idev, "LEGO USB Tower get version control request failed\n");
if (result < sizeof(*get_version_reply)) {
if (result >= 0)
result = -EIO;
dev_err(idev, "get version request failed: %d\n", result);
retval = result;
goto error;
}