4.17-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 01b3cdfca263a17554f7b249d20a247b2a751521 upstream.
Fix broken modem-status error handling which could lead to bits of slab data leaking to user space.
Fixes: 3b36a8fd6777 ("usb: fix uninitialized variable warning in keyspan_pda") Cc: stable stable@vger.kernel.org # 2.6.27 Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/keyspan_pda.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -369,8 +369,10 @@ static int keyspan_pda_get_modem_info(st 3, /* get pins */ USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN, 0, 0, data, 1, 2000); - if (rc >= 0) + if (rc == 1) *value = *data; + else if (rc >= 0) + rc = -EIO;
kfree(data); return rc;