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ethtool: fec: sanitize ethtool_fecparam->reserved

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struct ethtool_fecparam::reserved is never looked at by the core.
Make sure it's actually 0. Unfortunately we can't return an error
because old ethtool doesn't zero-initialize the structure for SET.
On GET we can be more verbose, there are no in tree (ab)users.

Fix up the kdoc on the structure. Remove the mention of FEC
bypass. Seems like a niche thing to configure in the first
place.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-03-24 18:11:57 -07:00 committed by David S. Miller
parent 408386817a
commit 240e114411
2 changed files with 6 additions and 1 deletions
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2
include/uapi/linux/ethtool.h
View File

@ -1380,7 +1380,7 @@ struct ethtool_per_queue_op {
* @cmd: Command number = %ETHTOOL_GFECPARAM or %ETHTOOL_SFECPARAM
* @active_fec: FEC mode which is active on the port
* @fec: Bitmask of supported/configured FEC modes
* @rsvd: Reserved for future extensions. i.e FEC bypass feature.
* @reserved: Reserved for future extensions, ignore on GET, write 0 for SET.
*/
struct ethtool_fecparam {
__u32 cmd;

5
net/ethtool/ioctl.c
View File

@ -2568,6 +2568,9 @@ static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
if (rc)
return rc;
if (WARN_ON_ONCE(fecparam.reserved))
fecparam.reserved = 0;
if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
return -EFAULT;
return 0;
@ -2583,6 +2586,8 @@ static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
return -EFAULT;
fecparam.reserved = 0;
return dev->ethtool_ops->set_fecparam(dev, &fecparam);
}