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523d35e3e1
AbortClient performs most of the same operations as CloseDownFileDescriptor except that it doesn't call ospoll_remove, leaving that unaware that the file descriptor has been closed. If the file descriptor is re-used before the server comes back around to clean up, and that new file descriptor is passed to SetNotifyFd, then that function will mistakenly re-interpret the stale ClientPtr returned by ospoll_data as a struct notify * instead and mangle data badly. To fix this, the patch does: 1) Change CloseDownFileDescriptor so that it can be called multiple times on the same OsCommPtr. The calls related to the file descriptor are moved inside the check for trans_conn and oc->trans_conn is set to NULL after cleaning up. 2) Move the XdmcpCloseDisplay call into CloseDownFileDescriptor. I don't think the actually matters as we just need to know at some point that the session client has exited. Moving it avoids the possibility of having this accidentally trigger from another client with the same fd which closes down at around the same time. 3) Change AbortClient to call CloseDownFileDescriptor. This makes sure that all of the fd-related clean up happens in the same way everywhere, in particular ensures that ospoll is notified about the closed file descriptor at the time it is closed and not some time later. Debian-bug: https://bugs.debian.org/862824 Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Keith Packard <keithp@keithp.com>
X Server
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