diff options
| author | Xin Long <lucien.xin@gmail.com> | 2017-06-17 16:10:27 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-19 15:13:43 -0400 |
| commit | 86fdb3448cc1ffe0e9f55380f1410f1d12c35f95 (patch) | |
| tree | b6fefe0b3cf22d208e9afa87f9dd638116ac6606 /net/sctp | |
| parent | 7fe5b914313ff67d71cb2b5aa4b850e0884e75dd (diff) | |
| download | linux-86fdb3448cc1ffe0e9f55380f1410f1d12c35f95.tar.bz2 | |
sctp: ensure ep is not destroyed before doing the dump
Now before dumping a sock in sctp_diag, it only holds the sock while
the ep may be already destroyed. It can cause a use-after-free panic
when accessing ep->asocs.
This patch is to set sctp_sk(sk)->ep NULL in sctp_endpoint_destroy,
and check if this ep is already destroyed before dumping this ep.
Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdrver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
| -rw-r--r-- | net/sctp/endpointola.c | 1 | ||||
| -rw-r--r-- | net/sctp/sctp_diag.c | 5 |
2 files changed, 4 insertions, 2 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c index 8c589230794f..3dcd0ecf3d99 100644 --- a/net/sctp/endpointola.c +++ b/net/sctp/endpointola.c @@ -275,6 +275,7 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep) if (sctp_sk(sk)->bind_hash) sctp_put_port(sk); + sctp_sk(sk)->ep = NULL; sock_put(sk); } diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c index 048954eee984..9a647214a91e 100644 --- a/net/sctp/sctp_diag.c +++ b/net/sctp/sctp_diag.c @@ -278,7 +278,6 @@ out: static int sctp_sock_dump(struct sock *sk, void *p) { - struct sctp_endpoint *ep = sctp_sk(sk)->ep; struct sctp_comm_param *commp = p; struct sk_buff *skb = commp->skb; struct netlink_callback *cb = commp->cb; @@ -287,7 +286,9 @@ static int sctp_sock_dump(struct sock *sk, void *p) int err = 0; lock_sock(sk); - list_for_each_entry(assoc, &ep->asocs, asocs) { + if (!sctp_sk(sk)->ep) + goto release; + list_for_each_entry(assoc, &sctp_sk(sk)->ep->asocs, asocs) { if (cb->args[4] < cb->args[1]) goto next; |