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 879241A71F for ; Mon, 9 Oct 2023 13:33:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DZfmkTPP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03FD2C433C8; Mon, 9 Oct 2023 13:33:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696858407; bh=EMQLJ1du3+3uZX1l1kAFpV60JIxS3+X2jIwum3FVd8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DZfmkTPPFEinf9bd1Lh6a86wbfMofqN+xTe9uUNIChbZNTnwGwGurbW0pJY98hch4 JXAtCd4vTXl7gWRVi5wWKLG/70ht9yhWmBmkQxFRStwH8lD/ijUWtTYyGtKVEbhCpK 9XJIXgw2gc+p+cZm8Fsmqma9EIQNikbSpt0UrM6w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeremy Cline , Simon Horman , Jakub Kicinski , Sasha Levin , syzbot+c1d0a03d305972dbbe14@syzkaller.appspotmail.com Subject: [PATCH 5.4 113/131] net: nfc: llcp: Add lock when modifying device list Date: Mon, 9 Oct 2023 15:02:33 +0200 Message-ID: <20231009130119.893486207@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130116.329529591@linuxfoundation.org> References: <20231009130116.329529591@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeremy Cline [ Upstream commit dfc7f7a988dad34c3bf4c053124fb26aa6c5f916 ] The device list needs its associated lock held when modifying it, or the list could become corrupted, as syzbot discovered. Reported-and-tested-by: syzbot+c1d0a03d305972dbbe14@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=c1d0a03d305972dbbe14 Signed-off-by: Jeremy Cline Reviewed-by: Simon Horman Fixes: 6709d4b7bc2e ("net: nfc: Fix use-after-free caused by nfc_llcp_find_local") Link: https://lore.kernel.org/r/20230908235853.1319596-1-jeremy@jcline.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/nfc/llcp_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c index ddfd159f64e13..b1107570eaee8 100644 --- a/net/nfc/llcp_core.c +++ b/net/nfc/llcp_core.c @@ -1646,7 +1646,9 @@ int nfc_llcp_register_device(struct nfc_dev *ndev) timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); + spin_lock(&llcp_devices_lock); list_add(&local->list, &llcp_devices); + spin_unlock(&llcp_devices_lock); return 0; } -- 2.40.1