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authorXufeng Zhang <xufeng.zhang@windriver.com>2014-06-12 10:53:36 +0800
committerDavid S. Miller <davem@davemloft.net>2014-06-12 10:27:14 -0700
commitd3217b15a19a4779c39b212358a5c71d725822ee (patch)
tree223a6277c362a5bb244e10b686430564f93dcddd
parent902455e00720018d1dbd38327c3fd5bda6d844ee (diff)
sctp: Fix sk_ack_backlog wrap-around problem
Consider the scenario: For a TCP-style socket, while processing the COOKIE_ECHO chunk in sctp_sf_do_5_1D_ce(), after it has passed a series of sanity check, a new association would be created in sctp_unpack_cookie(), but afterwards, some processing maybe failed, and sctp_association_free() will be called to free the previously allocated association, in sctp_association_free(), sk_ack_backlog value is decremented for this socket, since the initial value for sk_ack_backlog is 0, after the decrement, it will be 65535, a wrap-around problem happens, and if we want to establish new associations afterward in the same socket, ABORT would be triggered since sctp deem the accept queue as full. Fix this issue by only decrementing sk_ack_backlog for associations in the endpoint's list. Fix-suggested-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com> Acked-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sctp/associola.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 9e0509ce2f84..9de23a222d3f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -331,7 +331,7 @@ void sctp_association_free(struct sctp_association *asoc)
/* Only real associations count against the endpoint, so
* don't bother for if this is a temporary association.
*/
- if (!asoc->temp) {
+ if (!list_empty(&asoc->asocs)) {
list_del(&asoc->asocs);
/* Decrement the backlog value for a TCP-style listening