From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 5 Jan 2015 21:43:04 +0000 (-0500)
Subject: Fix: various compat poll/epoll issues
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=dbe23f452a025e8f42bdbb41e30a4a6257aa821c;hp=dbe23f452a025e8f42bdbb41e30a4a6257aa821c

Fix: various compat poll/epoll issues

poll:
- fix two nb_fd off by one in "add",
- simplify array size calculation,
- add error checking,
- compress the content of array before resizing it on "del"
  (out-of-bound memory access issue),
- set wait.nb_fd = 0 when no FD are present in array on wait,
- remove need_realloc flag: this can be checked internally by comparing
  current->alloc_size and wait->alloc_size. Minimize the number of
  duplicated state.

epoll:
- add error checking,
- simplify array size calculation (make it similar to poll),
- Set default size when poll_max_size is 0 within
  compat_epoll_set_max_size(), which allow better error checking
  elsewhere in epoll compat code.

Fixes #747

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---