Re: [PATCH] mem: fix possible memzone integer overflow

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2016-06-14 19:07, Sergio Gonzalez Monroy:
> It is possible to get an integer overflow if we try to reserve a memzone
> with len = 0 (meaning the maximum contiguous space available) and the
> maximum available elem size is less than (MALLOC_ELEM_OVERHEAD + align).
> 
> Issue reported by Coverity:
> 
>    >>> 10. overflow: Subtract operation overflows on operands len and
>    >>>     64UL.
>    >>> CID 107111 (#1 of 1): Overflowed return value (INTEGER_OVERFLOW)
>    >>> 11. overflow_sink: Overflowed or truncated value (or a value
>    >>>     computed from an overflowed or truncated value)
>    >>>     len - 64UL - align used as return value.
>    122         return len - MALLOC_ELEM_OVERHEAD - align;
> 
> Fixes: fafcc11985a2 ("mem: rework memzone to be allocated by malloc")
> 
> Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>

Applied, thanks