Commit 948e137a authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman

net: fix harmonize_features() vs NETIF_F_HIGHDMA

[ Upstream commit 7be2c82c ]

Ashizuka reported a highmem oddity and sent a patch for freescale
fec driver.

But the problem root cause is that core networking stack
must ensure no skb with highmem fragment is ever sent through
a device that does not assert NETIF_F_HIGHDMA in its features.

We need to call illegal_highdma() from harmonize_features()
regardless of CSUM checks.

Fixes: ec5f0615 ("net: Kill link between CSUM and SG features.")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Pravin Shelar <pshelar@ovn.org>
Reported-by: default avatar"Ashizuka, Yuusuke" <ashiduka@jp.fujitsu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d1c95f9c
......@@ -2815,9 +2815,9 @@ static netdev_features_t harmonize_features(struct sk_buff *skb,
if (skb->ip_summed != CHECKSUM_NONE &&
!can_checksum_protocol(features, type)) {
features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
} else if (illegal_highdma(skb->dev, skb)) {
features &= ~NETIF_F_SG;
}
if (illegal_highdma(skb->dev, skb))
features &= ~NETIF_F_SG;
return features;
}
......
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