From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 254031756F; Sat, 3 Feb 2024 04:12:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706933556; cv=none; b=gWH28RwCzl1JcOgvmjdtAfry2FXB+X+6+Lx4fg/mhdZQDq2g8bnMsKaYeGtIa94fV9wBJO1zwCPxvFRddfSEVK7zEL8/r+MUlEtSC3meUjxGKdX5BsMg8MMVN2cytbJ/Lc1i5sOR+hkAr2YVPjanMUviYA2T6xG+FcK173+OgSA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706933556; c=relaxed/simple; bh=d2TnKelmnG+vGWR9HtqDfQkETjRiAWPShyUb3PeRqgQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Qb2IlHpXLRwMvRt5oIwX8vmhirfUEVQmardgd3wmDphOKA1Dap1QhEh9zW0Yu4pyPvGRhtE9ppUbZ1ISEGrq/X9Z1sobMCJqCgtb3q4lwQEloMHs1b65sSvkQx3ZuWGaErG+z/vilZ3Y16+2X7NgTRmlFhwN328lQ79i3ZHj4ac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RuIeQQBo; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RuIeQQBo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFFC2C433A6; Sat, 3 Feb 2024 04:12:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1706933556; bh=d2TnKelmnG+vGWR9HtqDfQkETjRiAWPShyUb3PeRqgQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RuIeQQBoywt5NlNNyp4FGA0OWo6YpoiY6hetJHouYcgrLclzsggrfbwLQ0HTSq6Uf f2HjpzEx2YKz3B5Y/fEuYMH2dL0TK/UAqv39+eNVocYZQYyYjWO+NV/l33OcJF7wJc sFxckVxMRu1Q57lr0IHZ0nj+e/MW2Yn7+hW4GBbg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dmitry Antipov , =?UTF-8?q?J=C3=A9r=C3=B4me=20Pouiller?= , Kalle Valo , Sasha Levin Subject: [PATCH 6.6 108/322] wifi: wfx: fix possible NULL pointer dereference in wfx_set_mfp_ap() Date: Fri, 2 Feb 2024 20:03:25 -0800 Message-ID: <20240203035402.647803534@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240203035359.041730947@linuxfoundation.org> References: <20240203035359.041730947@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Antipov [ Upstream commit fe0a7776d4d19e613bb8dd80fe2d78ae49e8b49d ] Since 'ieee80211_beacon_get()' can return NULL, 'wfx_set_mfp_ap()' should check the return value before examining skb data. So convert the latter to return an appropriate error code and propagate it to return from 'wfx_start_ap()' as well. Compile tested only. Signed-off-by: Dmitry Antipov Tested-by: Jérôme Pouiller Acked-by: Jérôme Pouiller Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20231204171130.141394-1-dmantipov@yandex.ru Signed-off-by: Sasha Levin --- drivers/net/wireless/silabs/wfx/sta.c | 42 ++++++++++++++++----------- 1 file changed, 25 insertions(+), 17 deletions(-) diff --git a/drivers/net/wireless/silabs/wfx/sta.c b/drivers/net/wireless/silabs/wfx/sta.c index 626dfb4b7a55..073e870b2641 100644 --- a/drivers/net/wireless/silabs/wfx/sta.c +++ b/drivers/net/wireless/silabs/wfx/sta.c @@ -354,29 +354,38 @@ static int wfx_upload_ap_templates(struct wfx_vif *wvif) return 0; } -static void wfx_set_mfp_ap(struct wfx_vif *wvif) +static int wfx_set_mfp_ap(struct wfx_vif *wvif) { struct ieee80211_vif *vif = wvif_to_vif(wvif); struct sk_buff *skb = ieee80211_beacon_get(wvif->wdev->hw, vif, 0); const int ieoffset = offsetof(struct ieee80211_mgmt, u.beacon.variable); - const u16 *ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN, skb->data + ieoffset, - skb->len - ieoffset); const int pairwise_cipher_suite_count_offset = 8 / sizeof(u16); const int pairwise_cipher_suite_size = 4 / sizeof(u16); const int akm_suite_size = 4 / sizeof(u16); + const u16 *ptr; - if (ptr) { - ptr += pairwise_cipher_suite_count_offset; - if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) - return; - ptr += 1 + pairwise_cipher_suite_size * *ptr; - if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) - return; - ptr += 1 + akm_suite_size * *ptr; - if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) - return; - wfx_hif_set_mfp(wvif, *ptr & BIT(7), *ptr & BIT(6)); - } + if (unlikely(!skb)) + return -ENOMEM; + + ptr = (u16 *)cfg80211_find_ie(WLAN_EID_RSN, skb->data + ieoffset, + skb->len - ieoffset); + if (unlikely(!ptr)) + return -EINVAL; + + ptr += pairwise_cipher_suite_count_offset; + if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) + return -EINVAL; + + ptr += 1 + pairwise_cipher_suite_size * *ptr; + if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) + return -EINVAL; + + ptr += 1 + akm_suite_size * *ptr; + if (WARN_ON(ptr > (u16 *)skb_tail_pointer(skb))) + return -EINVAL; + + wfx_hif_set_mfp(wvif, *ptr & BIT(7), *ptr & BIT(6)); + return 0; } int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, @@ -394,8 +403,7 @@ int wfx_start_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, ret = wfx_hif_start(wvif, &vif->bss_conf, wvif->channel); if (ret > 0) return -EIO; - wfx_set_mfp_ap(wvif); - return ret; + return wfx_set_mfp_ap(wvif); } void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, -- 2.43.0