From: David S. Miller <davem@davemloft.net>
Date: Tue, 2 Jul 2019 02:15:46 +0000 (-0700)
Subject: Merge branch 'idr-fix-overflow-cases-on-32-bit-CPU'
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8a534f8fb0dc44694a437b575060499efd1c91de;p=linux.git

Merge branch 'idr-fix-overflow-cases-on-32-bit-CPU'

Cong Wang says:

====================
idr: fix overflow cases on 32-bit CPU

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.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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8a534f8fb0dc44694a437b575060499efd1c91de