From: Ivan Vecera <ivecera@xxxxxxxxxx>
[ Upstream commit ef72cd3c5ce168829c6684ecb2cae047d3493690 ]
Fix two error paths in ethnl_set_channels() to avoid lock-up caused
but unreleased RTNL.
Fixes: e19c591eafad ("ethtool: set device channel counts with CHANNELS_SET request")
Reported-by: LiLiang <liali@xxxxxxxxxx>
Signed-off-by: Ivan Vecera <ivecera@xxxxxxxxxx>
Reviewed-by: Michal Kubecek <mkubecek@xxxxxxx>
Link: https://lore.kernel.org/r/20201215090810.801777-1-ivecera@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ethtool/channels.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/ethtool/channels.c
+++ b/net/ethtool/channels.c
@@ -194,8 +194,9 @@ int ethnl_set_channels(struct sk_buff *s
if (netif_is_rxfh_configured(dev) &&
!ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
(channels.combined_count + channels.rx_count) <= max_rx_in_use) {
+ ret = -EINVAL;
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table settings");
- return -EINVAL;
+ goto out_ops;
}
/* Disabling channels, query zero-copy AF_XDP sockets */
@@ -203,8 +204,9 @@ int ethnl_set_channels(struct sk_buff *s
min(channels.rx_count, channels.tx_count);
for (i = from_channel; i < old_total; i++)
if (xsk_get_pool_from_qid(dev, i)) {
+ ret = -EINVAL;
GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets");
- return -EINVAL;
+ goto out_ops;
}
ret = dev->ethtool_ops->set_channels(dev, &channels);
