Commit 1b205c2d authored by Roland Dreier's avatar Roland Dreier Committed by Roland Dreier

[PATCH] IB: fix CM use-after-free

If the CM REQ handling function gets to error2, then it frees
cm_id_priv->timewait_info.  But the next line goes through
ib_destroy_cm_id() -> ib_send_cm_rej() -> cm_reset_to_idle(),
which ends up calling cm_cleanup_timewait(), which dereferences the
pointer we just freed.  Make sure we clear cm_id_priv->timewait_info
after freeing it, so that doesn't happen.
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 354ba39c
......@@ -1315,6 +1315,7 @@ error3: atomic_dec(&cm_id_priv->refcount);
cm_deref_id(listen_cm_id_priv);
cm_cleanup_timewait(cm_id_priv->timewait_info);
error2: kfree(cm_id_priv->timewait_info);
cm_id_priv->timewait_info = NULL;
error1: ib_destroy_cm_id(&cm_id_priv->id);
return ret;
}
......
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