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 60FB52E9EBF; Tue, 15 Jul 2025 13:39:32 +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=1752586772; cv=none; b=i7HzmOPIgsdby4c2m+DNTYmKONoRlCXQX19P/TtHYmqFpcEg3wtOiwlIOKFiA2k29degL40a31PiOps+49fjDxipz+9WrwGE9fzQ0I7hKfx+EOveMTgCbHN4XSXcs4rn4LPx1QJ98j80paMHHI49WWiRxYvoG+nKpj4Jc9RKpdk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752586772; c=relaxed/simple; bh=FsNG3ndXljPyU4Fr+NKKLlWRJBwQUkfEuZ2TqknJIbg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KoHxgO/uISBNXvqHRxULZ2RVw95dU7JYR5lJoQnVrKePeDAGCSPgVsHMGO31+dWRFAXeKZByO7Tvo9hV9y2Yi9ympeenWJPUSijXzy6aIO5iqfsq8csPi0bPcgt7Pb/ipP4PAZj64rcGODF51rr/pyxpBxt6PwQjtA14aQJYCnA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=A9yCqbXj; 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="A9yCqbXj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EB45DC4CEE3; Tue, 15 Jul 2025 13:39:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752586772; bh=FsNG3ndXljPyU4Fr+NKKLlWRJBwQUkfEuZ2TqknJIbg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A9yCqbXjhNf4IQO0chO6SCSiyehdLuBMYR46ZEF/TztDOEXBI3tjhaMoCOgkU3bnY hT/xM+z5n66JHlD6Q8pQPwsWTM9mu2/laLAhFLbv8vFaiVUFtFp3TnkQkHr1b1yPcS fYsAUcFTc1Fnng+HFRxniCRx2sJzhUWPdBjJ/TGE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuniyuki Iwashima , Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.15 042/192] atm: clip: Fix memory leak of struct clip_vcc. Date: Tue, 15 Jul 2025 15:12:17 +0200 Message-ID: <20250715130816.542157413@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130814.854109770@linuxfoundation.org> References: <20250715130814.854109770@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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kuniyuki Iwashima [ Upstream commit 62dba28275a9a3104d4e33595c7b3328d4032d8d ] ioctl(ATMARP_MKIP) allocates struct clip_vcc and set it to vcc->user_back. The code assumes that vcc_destroy_socket() passes NULL skb to vcc->push() when the socket is close()d, and then clip_push() frees clip_vcc. However, ioctl(ATMARPD_CTRL) sets NULL to vcc->push() in atm_init_atmarp(), resulting in memory leak. Let's serialise two ioctl() by lock_sock() and check vcc->push() in atm_init_atmarp() to prevent memleak. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250704062416.1613927-3-kuniyu@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/atm/clip.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/atm/clip.c b/net/atm/clip.c index f36f2c7d87146..9c9c6c3d98861 100644 --- a/net/atm/clip.c +++ b/net/atm/clip.c @@ -645,6 +645,9 @@ static struct atm_dev atmarpd_dev = { static int atm_init_atmarp(struct atm_vcc *vcc) { + if (vcc->push == clip_push) + return -EINVAL; + mutex_lock(&atmarpd_lock); if (atmarpd) { mutex_unlock(&atmarpd_lock); @@ -669,6 +672,7 @@ static int atm_init_atmarp(struct atm_vcc *vcc) static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct atm_vcc *vcc = ATM_SD(sock); + struct sock *sk = sock->sk; int err = 0; switch (cmd) { @@ -689,14 +693,18 @@ static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) err = clip_create(arg); break; case ATMARPD_CTRL: + lock_sock(sk); err = atm_init_atmarp(vcc); if (!err) { sock->state = SS_CONNECTED; __module_get(THIS_MODULE); } + release_sock(sk); break; case ATMARP_MKIP: + lock_sock(sk); err = clip_mkip(vcc, arg); + release_sock(sk); break; case ATMARP_SETENTRY: err = clip_setentry(vcc, (__force __be32)arg); -- 2.39.5