From: Neil Horman <nhorman@tuxdriver.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Vlad Yasevich <vyasevich@gmail.com>,
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
linux-sctp@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH net] sctp: walk the list of asoc safely
Date: Fri, 1 Feb 2019 10:55:03 -0500 [thread overview]
Message-ID: <20190201155503.GB5970@hmswarspite.think-freely.org> (raw)
In-Reply-To: <20190201141522.GA20785@kroah.com>
On Fri, Feb 01, 2019 at 03:15:22PM +0100, Greg Kroah-Hartman wrote:
> In sctp_sendmesg(), when walking the list of endpoint associations, the
> association can be dropped from the list, making the list corrupt.
> Properly handle this by using list_for_each_entry_safe()
>
> Fixes: 4910280503f3 ("sctp: add support for snd flag SCTP_SENDALL process in sendmsg")
> Reported-by: Secunia Research <vuln@secunia.com>
> Tested-by: Secunia Research <vuln@secunia.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index f93c3cf9e567..65d6d04546ae 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -2027,7 +2027,7 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
> struct sctp_endpoint *ep = sctp_sk(sk)->ep;
> struct sctp_transport *transport = NULL;
> struct sctp_sndrcvinfo _sinfo, *sinfo;
> - struct sctp_association *asoc;
> + struct sctp_association *asoc, *tmp;
> struct sctp_cmsgs cmsgs;
> union sctp_addr *daddr;
> bool new = false;
> @@ -2053,7 +2053,7 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
>
> /* SCTP_SENDALL process */
> if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
> - list_for_each_entry(asoc, &ep->asocs, asocs) {
> + list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
> err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
> msg_len);
> if (err == 0)
>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
next prev parent reply other threads:[~2019-02-01 15:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 14:15 [PATCH net] sctp: walk the list of asoc safely Greg Kroah-Hartman
2019-02-01 14:20 ` Marcelo Ricardo Leitner
2019-02-01 14:43 ` Greg Kroah-Hartman
2019-02-01 14:58 ` Marcelo Ricardo Leitner
2019-02-01 15:55 ` Neil Horman [this message]
2019-02-01 19:04 ` David Miller
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