[Patch net 0/3] idr: fix overflow cases on 32-bit CPU

[Cong Wang <xiyou.wangcong@gmail.com>]

idr_get_next_ul() is problematic by design, it can't handle
the following overflow case well on 32-bit CPU:

u32 id = UINT_MAX;
idr_alloc_u32(&id);
while (idr_get_next_ul(&id) != NULL)
 id++;

when 'id' overflows and becomes 0 after UINT_MAX, the loop
goes infinite.

Fix this by eliminating external users of idr_get_next_ul()
and migrating them to idr_for_each_entry_continue_ul(). And
add an additional parameter for these iteration macros to detect
overflow properly.

Please merge this through networking tree, as all the users
are in networking subsystem.

Cong Wang (2):
  idr: fix overflow case for idr_for_each_entry_ul()
  idr: introduce idr_for_each_entry_continue_ul()

Davide Caratti (1):
  selftests: add a test case for cls_lower handle overflow

---
 .../ethernet/mellanox/mlx5/core/fs_counters.c | 10 ++++---
 include/linux/idr.h                           | 21 +++++++++++++--
 net/sched/act_api.c                           |  9 ++++---
 net/sched/cls_flower.c                        | 27 +++++--------------
 .../tc-testing/tc-tests/filters/tests.json    | 19 +++++++++++++
 5 files changed, 57 insertions(+), 29 deletions(-)

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2.21.0