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net: ethtool: Don't call .cleanup_data when prepare_data fails

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There's a consistent pattern where the .cleanup_data() callback is
called when .prepare_data() fails, when it should really be called to
clean after a successful .prepare_data() as per the documentation.

Rewrite the error-handling paths to make sure we don't cleanup
un-prepared data.

Fixes: c781ff12a2f3 ("ethtool: Allow network drivers to dump arbitrary EEPROM data")
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20250407130511.75621-1-maxime.chevallier@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Maxime Chevallier 2025-04-07 15:05:10 +02:00 committed by Paolo Abeni
parent 369609fc62
commit 4f038a6a02
1 changed files with 5 additions and 3 deletions
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8
net/ethtool/netlink.c
View File

@ -500,7 +500,7 @@ static int ethnl_default_doit(struct sk_buff *skb, struct genl_info *info)
netdev_unlock_ops(req_info->dev);
rtnl_unlock();
if (ret < 0)
goto err_cleanup;
goto err_dev;
ret = ops->reply_size(req_info, reply_data);
if (ret < 0)
goto err_cleanup;
@ -560,7 +560,7 @@ static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
netdev_unlock_ops(dev);
rtnl_unlock();
if (ret < 0)
goto out;
goto out_cancel;
ret = ethnl_fill_reply_header(skb, dev, ctx->ops->hdr_attr);
if (ret < 0)
goto out;
@ -569,6 +569,7 @@ static int ethnl_default_dump_one(struct sk_buff *skb, struct net_device *dev,
out:
if (ctx->ops->cleanup_data)
ctx->ops->cleanup_data(ctx->reply_data);
out_cancel:
ctx->reply_data->dev = NULL;
if (ret < 0)
genlmsg_cancel(skb, ehdr);
@ -793,7 +794,7 @@ static void ethnl_default_notify(struct net_device *dev, unsigned int cmd,
ethnl_init_reply_data(reply_data, ops, dev);
ret = ops->prepare_data(req_info, reply_data, &info);
if (ret < 0)
goto err_cleanup;
goto err_rep;
ret = ops->reply_size(req_info, reply_data);
if (ret < 0)
goto err_cleanup;
@ -828,6 +829,7 @@ err_skb:
err_cleanup:
if (ops->cleanup_data)
ops->cleanup_data(reply_data);
err_rep:
kfree(reply_data);
kfree(req_info);
return;