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authorXufeng Zhang <xufeng.zhang@windriver.com>2014-06-12 10:53:36 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-26 15:10:28 -0400
commit3309a9750b319afc809caa29b8091e9746ec8ce0 (patch)
parent843c0172bce9a30d77c85f33268b1469ead716ad (diff)
sctp: Fix sk_ack_backlog wrap-around problem
[ Upstream commit d3217b15a19a4779c39b212358a5c71d725822ee ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 3c04692d699a..25b207b3ffe4 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -389,7 +389,7 @@ 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)) {
/* Decrement the backlog value for a TCP-style listening