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 C4B3A233725; Mon, 10 Mar 2025 17:57:00 +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=1741629420; cv=none; b=hBJgzuuKmmWBlxK32ktYrbGfYT1bVtIsGrOgpYEXZFVYaHkTHRtft3/wdGS/anCuW8ivdmdkXftqF+fTQD02OMXUxCR+Bco2j5jV4Y96JpISVf4guMxotoHfrHEDM01Xnzb/T9vjz32twp3mXY4cj2HlrnuCDYNPU0RQH5kxv6E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741629420; c=relaxed/simple; bh=xw5XxGCVAXOyIAeunAekz6pYWirFV6so3XnIHMiKitg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NwwZHaRPuqH9rAYgD2HIbH8Yrf+1PTJLiC7WAP5VY+VGMUino9CoAPMjMzqtGEoCkJYujEUgW6XQOVvjqz+SyfrosXvANkgFSpiSlfD5Ua9CZrYewktVZsNDeyqpolAx0tLPlx3zLgvicD+5YxzQU8MEKXgi2R5AmQeWhdauEhs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=y54N18LC; 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="y54N18LC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17880C4CEE5; Mon, 10 Mar 2025 17:56:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741629420; bh=xw5XxGCVAXOyIAeunAekz6pYWirFV6so3XnIHMiKitg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=y54N18LCbr1IOjr3gMfktfe9sSxJuo+wRpujSJx3k1YsS9tnl0+Tfst0jwvNL7BbX zPfgpKi9hULpsmrNOjBmlzeWkn2k5Uifk7S6vrWva2KRsnUg4MQdv/PhPgP7Q6LdDb Mi5mQGd1RG7nkYVw5ifOZ0effVzVCoXrdhZzD0H0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+7ff41b5215f0c534534e@syzkaller.appspotmail.com, Eric Dumazet , Paolo Abeni , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 247/620] net: rose: lock the socket in rose_bind() Date: Mon, 10 Mar 2025 18:01:33 +0100 Message-ID: <20250310170555.378794039@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170545.553361750@linuxfoundation.org> References: <20250310170545.553361750@linuxfoundation.org> User-Agent: quilt/0.68 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-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit a1300691aed9ee852b0a9192e29e2bdc2411a7e6 ] syzbot reported a soft lockup in rose_loopback_timer(), with a repro calling bind() from multiple threads. rose_bind() must lock the socket to avoid this issue. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot+7ff41b5215f0c534534e@syzkaller.appspotmail.com Closes: https://lore.kernel.org/netdev/67a0f78d.050a0220.d7c5a.00a0.GAE@google.com/T/#u Signed-off-by: Eric Dumazet Acked-by: Paolo Abeni Link: https://patch.msgid.link/20250203170838.3521361-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/rose/af_rose.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index 65fd5b99f9dea..f8cd085c42345 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -700,11 +700,9 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) struct net_device *dev; ax25_address *source; ax25_uid_assoc *user; + int err = -EINVAL; int n; - if (!sock_flag(sk, SOCK_ZAPPED)) - return -EINVAL; - if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose)) return -EINVAL; @@ -717,8 +715,15 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) if ((unsigned int) addr->srose_ndigis > ROSE_MAX_DIGIS) return -EINVAL; - if ((dev = rose_dev_get(&addr->srose_addr)) == NULL) - return -EADDRNOTAVAIL; + lock_sock(sk); + + if (!sock_flag(sk, SOCK_ZAPPED)) + goto out_release; + + err = -EADDRNOTAVAIL; + dev = rose_dev_get(&addr->srose_addr); + if (!dev) + goto out_release; source = &addr->srose_call; @@ -729,7 +734,8 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) } else { if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { dev_put(dev); - return -EACCES; + err = -EACCES; + goto out_release; } rose->source_call = *source; } @@ -751,8 +757,10 @@ static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) rose_insert_socket(sk); sock_reset_flag(sk, SOCK_ZAPPED); - - return 0; + err = 0; +out_release: + release_sock(sk); + return err; } static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) -- 2.39.5