x86/mm: Fix range check in tlbflush debugfs interface
authorJan Beulich <JBeulich@suse.com>
Fri, 7 Sep 2012 06:54:52 +0000 (07:54 +0100)
committerIngo Molnar <mingo@kernel.org>
Fri, 7 Sep 2012 08:56:02 +0000 (10:56 +0200)
commitd4c9dbc61fe0ca042b835c6f234af12fa5f18310
treeea2e11e59de9492a7984fc9681da99b1e4239881
parent057237bb35a605d795fd787868a1088705f26ee5
x86/mm: Fix range check in tlbflush debugfs interface

Since the shift count settable there is used for shifting values
of type "unsigned long", its value must not match or exceed
BITS_PER_LONG (otherwise the shift operations are undefined).

Similarly, the value must not be negative (but -1 must be
permitted, as that's the value used to distinguish the case of
the fine grained flushing being disabled).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Alex Shi <alex.shi@intel.com>
Link: http://lkml.kernel.org/r/5049B65C020000780009990C@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/mm/tlb.c