From cff69f72d33318f4ccfe7d5ff6c5616d00dd45a7 Mon Sep 17 00:00:00 2001 From: Diogo Jahchan Koike Date: Thu, 29 Aug 2024 15:48:27 -0300 Subject: [PATCH] ethtool: pse-pd: move pse validation into set 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: 31748765bed3 ("net: ethtool: pse-pd: Target the command to the requested PHY") Signed-off-by: Diogo Jahchan Koike Reviewed-by: Maxime Chevallier Link: https://patch.msgid.link/20240829184830.5861-1-djahchankoike@gmail.com Signed-off-by: Jakub Kicinski --- net/ethtool/pse-pd.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c index 507cb21d6bf0..a0705edca22a 100644 --- a/net/ethtool/pse-pd.c +++ b/net/ethtool/pse-pd.c @@ -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 */ };