From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A821AC33C9E for ; Sat, 11 Jan 2020 10:18:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7BCE9205F4 for ; Sat, 11 Jan 2020 10:18:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737932; bh=PA0/aI9Bp2HCVU34jDMh6IaSmZfDkmadue7QEhVjXXg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nWMc4hKtDWwGgViP/c0N5BskiZrY3h7YGYl9a5Iq8fRKyCRAwyAA6kg3XOQLXyhzv h+EzIT9rV8/homQTD1PxIh+jzfLFsCeZ42jY1EOOF+Cgtwx+XsFdiaapcHfuN6cNrO 7gF1XyufnQ4lj6x4SktQjs3hK3kSxbkVLtAoZTxs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730296AbgAKKSv (ORCPT ); Sat, 11 Jan 2020 05:18:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:37462 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729166AbgAKKSt (ORCPT ); Sat, 11 Jan 2020 05:18:49 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5FD14205F4; Sat, 11 Jan 2020 10:18:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737928; bh=PA0/aI9Bp2HCVU34jDMh6IaSmZfDkmadue7QEhVjXXg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HGqdx9V5pN2CIA4R7rBn5c7AAbJJzV8HcTT/cLLvx4xgd0vAl/MDY4zz5TdA4qnUY aTHDVNg0gZNWUknRO7z/RG/5FNTQwM2Ox726vePCdeya1H1rguVKD7AaEhE5iu2/OL K7X6Y3FLLCeEDlojT/68el4YXEDM1/fmmZzK1AFA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+107c4aff5f392bf1517f@syzkaller.appspotmail.com, Xin Long , "David S. Miller" Subject: [PATCH 4.19 74/84] sctp: free cmd->obj.chunk for the unprocessed SCTP_CMD_REPLY Date: Sat, 11 Jan 2020 10:50:51 +0100 Message-Id: <20200111094911.909384256@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094845.328046411@linuxfoundation.org> References: <20200111094845.328046411@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xin Long [ Upstream commit be7a7729207797476b6666f046d765bdf9630407 ] This patch is to fix a memleak caused by no place to free cmd->obj.chunk for the unprocessed SCTP_CMD_REPLY. This issue occurs when failing to process a cmd while there're still SCTP_CMD_REPLY cmds on the cmd seq with an allocated chunk in cmd->obj.chunk. So fix it by freeing cmd->obj.chunk for each SCTP_CMD_REPLY cmd left on the cmd seq when any cmd returns error. While at it, also remove 'nomem' label. Reported-by: syzbot+107c4aff5f392bf1517f@syzkaller.appspotmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Xin Long Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sctp/sm_sideeffect.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) --- a/net/sctp/sm_sideeffect.c +++ b/net/sctp/sm_sideeffect.c @@ -1373,8 +1373,10 @@ static int sctp_cmd_interpreter(enum sct /* Generate an INIT ACK chunk. */ new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, 0); - if (!new_obj) - goto nomem; + if (!new_obj) { + error = -ENOMEM; + break; + } sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(new_obj)); @@ -1396,7 +1398,8 @@ static int sctp_cmd_interpreter(enum sct if (!new_obj) { if (cmd->obj.chunk) sctp_chunk_free(cmd->obj.chunk); - goto nomem; + error = -ENOMEM; + break; } sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(new_obj)); @@ -1443,8 +1446,10 @@ static int sctp_cmd_interpreter(enum sct /* Generate a SHUTDOWN chunk. */ new_obj = sctp_make_shutdown(asoc, chunk); - if (!new_obj) - goto nomem; + if (!new_obj) { + error = -ENOMEM; + break; + } sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(new_obj)); break; @@ -1780,11 +1785,17 @@ static int sctp_cmd_interpreter(enum sct break; } - if (error) + if (error) { + cmd = sctp_next_cmd(commands); + while (cmd) { + if (cmd->verb == SCTP_CMD_REPLY) + sctp_chunk_free(cmd->obj.chunk); + cmd = sctp_next_cmd(commands); + } break; + } } -out: /* If this is in response to a received chunk, wait until * we are done with the packet to open the queue so that we don't * send multiple packets in response to a single request. @@ -1799,7 +1810,4 @@ out: sp->data_ready_signalled = 0; return error; -nomem: - error = -ENOMEM; - goto out; }