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 E37F0171A8 for ; Mon, 8 May 2023 11:39:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20086C4339B; Mon, 8 May 2023 11:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683545981; bh=6ck7e7eI+hBXeJkDorrBdi8MeB8c0A3KgbQdy1z/BZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SoU+QSMfqitqXCRycEaVqw31e3MkUpu966qJEp0JtfBIF3I/28e0nrwNQ43dAOTt8 LuFJwtg/26tH1tjfxqauNS3cu+sLOgJLNjN0o4cTKiOdCzb1/y7+OQHtO+ir3kYQS+ 2bfXwc96t8g3GzGEfXg0G2hUdj7X1kWpGb4sdlUw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kang Chen , Felix Fietkau , Sasha Levin Subject: [PATCH 5.15 217/371] wifi: mt76: handle failure of vzalloc in mt7615_coredump_work Date: Mon, 8 May 2023 11:46:58 +0200 Message-Id: <20230508094820.680007151@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094811.912279944@linuxfoundation.org> References: <20230508094811.912279944@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Kang Chen [ Upstream commit 9e47dd9f64a47ae00ca0123017584c37209ee900 ] vzalloc may fails, dump might be null and will cause illegal address access later. Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support") Signed-off-by: Kang Chen Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c index c7e084821b292..37bc307c19719 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c @@ -2273,7 +2273,7 @@ void mt7615_coredump_work(struct work_struct *work) break; skb_pull(skb, sizeof(struct mt7615_mcu_rxd)); - if (data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) { + if (!dump || data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) { dev_kfree_skb(skb); continue; } @@ -2283,6 +2283,8 @@ void mt7615_coredump_work(struct work_struct *work) dev_kfree_skb(skb); } - dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ, - GFP_KERNEL); + + if (dump) + dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ, + GFP_KERNEL); } -- 2.39.2