Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 17/25] net: cdc_ncm: Signedness bug in cdc_ncm_set_dgram_size() | Date | Fri, 22 Nov 2019 14:48:50 -0500 |
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From: Dan Carpenter <dan.carpenter@oracle.com>
[ Upstream commit a56dcc6b455830776899ce3686735f1172e12243 ]
This code is supposed to test for negative error codes and partial reads, but because sizeof() is size_t (unsigned) type then negative error codes are type promoted to high positive values and the condition doesn't work as expected.
Fixes: 332f989a3b00 ("CDC-NCM: handle incomplete transfer of MTU") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/net/usb/cdc_ncm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index a57d82ef0f810..1f57a6a2b8a25 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -579,7 +579,7 @@ static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size) err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE, USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE, 0, iface_no, &max_datagram_size, sizeof(max_datagram_size)); - if (err < sizeof(max_datagram_size)) { + if (err != sizeof(max_datagram_size)) { dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n"); goto out; } -- 2.20.1
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