From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpo75.interia.pl (smtpo75.interia.pl [217.74.67.75]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80F7B361DDC for ; Thu, 13 Aug 2026 09:04:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.74.67.75 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786611896; cv=none; b=KSyLoJDjxFmJCpl2uukare58NyoAeH0G8IFcjHCei4uQGTuIsxe1eCxB5TnJRbkvNmqlw40/HGkhEkLLMKk9jFngY0VZXA25Rjw6BwGrdWOectnI7TPbbAPsl2LELsnM+ySz2F4L9FzmYz9agGBlFnovZdx4Wkmnb1KNepOjazQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786611896; c=relaxed/simple; bh=bDboF+sXTcdnYjN9pGdiSqM5dfNz9ZSQi823leFT+gw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EbIwPsrPcBM9CS5iIFH5KLEnmgxlQB/6MQlAezW9uVwTuA2ROh6IM0Gd4TmWDL66YTeW2a4JigOcpUEc+Tuu17VlorEjfVM7jy5WCFErEtHBeognbxdJmdbsM7fmXIC0o8sumOZDyWkEtucq9RqSwhp9WUhY75FwYMkD1xRBLj4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=poczta.fm; spf=pass smtp.mailfrom=poczta.fm; dkim=pass (1024-bit key) header.d=poczta.fm header.i=@poczta.fm header.b=K/UzOfuM; arc=none smtp.client-ip=217.74.67.75 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=poczta.fm Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=poczta.fm Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=poczta.fm header.i=@poczta.fm header.b="K/UzOfuM" Received: from localhost (unknown [80.68.231.31]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by poczta.interia.pl (INTERIA.PL) with ESMTPSA; Thu, 13 Aug 2026 11:04:45 +0200 (CEST) From: Slawomir Stepien To: syzkaller-bugs@googlegroups.com, johannes@sipsolutions.net, linux-wireless@vger.kernel.org Cc: linux-kernel@vger.kernel.org, syzbot@lists.linux.dev, sst@poczta.fm, syzbot+9bdc0c5998ab45b05030@syzkaller.appspotmail.com Subject: [PATCH 2/3] wifi: cfg80211: move link_id validation earlier in nl80211_new_station() Date: Thu, 13 Aug 2026 11:04:33 +0200 Message-ID: <20260813090434.2071318-2-sst@poczta.fm> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260813090434.2071318-1-sst@poczta.fm> References: <20260813090434.2071318-1-sst@poczta.fm> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=poczta.fm; s=dk; t=1786611886; bh=csBUxTAsN86gwAH/axYN10YvWGNt5H8M3XCNZoUAPig=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=K/UzOfuMnTxom2zv9Onk4GDsKLEA6FITDCZTrOA3ZWFahmlX7r+7SXjThvO0zIje4 LL2K0ErNk4A+747mWU0GVrZsPWh1rov2W34F0Ll86lDm7qKMMffsWpLmaLNdxhER1i B2QTMQOBY7RrrEbhb5Y1nI8HVLEcnci4dHVw98ys= I do not see a reason why this check is so low in the function. Move it up right next to param fetch. This new position is more beneficial for AP/Link state check that will be added in upcoming commit. Signed-off-by: Slawomir Stepien --- net/wireless/nl80211.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 0c4e6bd6a44c..ebde52655904 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -9222,6 +9222,16 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) params.link_sta_params.link_id = nl80211_link_id_or_invalid(info->attrs); + if (wdev->valid_links) { + if (params.link_sta_params.link_id < 0) + return -EINVAL; + if (!(wdev->valid_links & BIT(params.link_sta_params.link_id))) + return -ENOLINK; + } else { + if (params.link_sta_params.link_id >= 0) + return -EINVAL; + } + if (info->attrs[NL80211_ATTR_MLD_ADDR]) { mac_addr = nla_data(info->attrs[NL80211_ATTR_MLD_ADDR]); params.link_sta_params.mld_mac = mac_addr; @@ -9494,27 +9504,10 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) /* be aware of params.vlan when changing code here */ - if (wdev->valid_links) { - if (params.link_sta_params.link_id < 0) { - err = -EINVAL; - goto out; - } - if (!(wdev->valid_links & BIT(params.link_sta_params.link_id))) { - err = -ENOLINK; - goto out; - } - } else { - if (params.link_sta_params.link_id >= 0) { - err = -EINVAL; - goto out; - } - } - params.epp_peer = nla_get_flag(info->attrs[NL80211_ATTR_EPP_PEER]); err = rdev_add_station(rdev, wdev, mac_addr, ¶ms); -out: dev_put(params.vlan); return err; } -- 2.55.0