drivers: char: mem: Fix wraparound check to allow mappings up to the end

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commit 32829da54d upstream.

A recent fix to /dev/mem prevents mappings from wrapping around the end
of physical address space. However, the check was written in a way that
also prevents a mapping reaching just up to the end of physical address
space, which may be a valid use case (especially on 32-bit systems).
This patch fixes it by checking the last mapped address (instead of the
first address behind that) for overflow.

Fixes: b299cde245 ("drivers: char: mem: Check for address space wraparound with mmap()")
Reported-by: Nico Huber <nico.h@gmx.de>
Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Julius Werner 2017-06-02 15:36:39 -07:00 • committed by Greg Kroah-Hartman

parent 106c77e825

commit 9ff4a1a36a

1 changed files with 1 additions and 1 deletions

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drivers/char/mem.c

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