mm/vmscan.c: fix int overflow in callers of do_shrink_slab()

do_shrink_slab() returns unsigned long value, and the placing into int
variable cuts high bytes off.  Then we compare ret and 0xfffffffe (since
SHRINK_EMPTY is converted to ret type).

Thus a large number of objects returned by do_shrink_slab() may be
interpreted as SHRINK_EMPTY, if low bytes of their value are equal to
0xfffffffe.  Fix that by declaration ret as unsigned long in these
functions.

Link: http://lkml.kernel.org/r/153813407177.17544.14888305435570723973.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai <[email protected]>
Reported-by: Cyrill Gorcunov <[email protected]>
Acked-by: Cyrill Gorcunov <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Shakeel Butt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

0 files changed, 0 insertions, 0 deletions