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ethtool: pse-pd: move pse validation into set

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Move validation into set, removing .set_validate operation as its current
implementation holds the rtnl lock for acquiring the PHY device, defeating
the intended purpose of checking before grabbing the lock.

Reported-by: syzbot+ec369e6d58e210135f71@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=ec369e6d58e210135f71
Fixes: 31748765be ("net: ethtool: pse-pd: Target the command to the requested PHY")
Signed-off-by: Diogo Jahchan Koike <djahchankoike@gmail.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20240829184830.5861-1-djahchankoike@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Diogo Jahchan Koike 2024-08-29 15:48:27 -03:00 committed by Jakub Kicinski
parent 6af91e3d2c
commit cff69f72d3
1 changed files with 6 additions and 9 deletions
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15
net/ethtool/pse-pd.c
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@ -222,13 +222,10 @@ const struct nla_policy ethnl_pse_set_policy[ETHTOOL_A_PSE_MAX + 1] = {
};
static int
ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
ethnl_set_pse_validate(struct phy_device *phydev, struct genl_info *info)
{
struct nlattr **tb = info->attrs;
struct phy_device *phydev;
phydev = ethnl_req_get_phydev(req_info, tb[ETHTOOL_A_PSE_HEADER],
info->extack);
if (IS_ERR_OR_NULL(phydev)) {
NL_SET_ERR_MSG(info->extack, "No PHY is attached");
return -EOPNOTSUPP;
@ -254,7 +251,7 @@ ethnl_set_pse_validate(struct ethnl_req_info *req_info, struct genl_info *info)
return -EOPNOTSUPP;
}
return 1;
return 0;
}
static int
@ -262,12 +259,13 @@ ethnl_set_pse(struct ethnl_req_info *req_info, struct genl_info *info)
{
struct nlattr **tb = info->attrs;
struct phy_device *phydev;
int ret = 0;
int ret;
phydev = ethnl_req_get_phydev(req_info, tb[ETHTOOL_A_PSE_HEADER],
info->extack);
if (IS_ERR_OR_NULL(phydev))
return -ENODEV;
ret = ethnl_set_pse_validate(phydev, info);
if (ret)
return ret;
if (tb[ETHTOOL_A_C33_PSE_AVAIL_PW_LIMIT]) {
unsigned int pw_limit;
@ -314,7 +312,6 @@ const struct ethnl_request_ops ethnl_pse_request_ops = {
.fill_reply = pse_fill_reply,
.cleanup_data = pse_cleanup_data,
.set_validate = ethnl_set_pse_validate,
.set = ethnl_set_pse,
/* PSE has no notification */
};