From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Thu, 20 Feb 2020 14:54:56 +0000 (+0100)
Subject: s390/qeth: fix off-by-one in RX copybreak check
X-Git-Tag: v5.5.8~51
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=227fb1306d0638a7bf1e9a97f033b07cc52def57;p=users%2Fdwmw2%2Flinux.git

s390/qeth: fix off-by-one in RX copybreak check

commit 54a61fbc020fd2e305680871c453abcf7fc0339b upstream.

The RX copybreak is intended as the _max_ value where the frame's data
should be copied. So for frame_len == copybreak, don't build an SG skb.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 29facb9136715..10edfd6fc9302 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5142,7 +5142,7 @@ next_packet:
 	}
 
 	use_rx_sg = (card->options.cq == QETH_CQ_ENABLED) ||
-		    ((skb_len >= card->options.rx_sg_cb) &&
+		    (skb_len > card->options.rx_sg_cb &&
 		     !atomic_read(&card->force_alloc_skb) &&
 		     !IS_OSN(card));