K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2018-01-23T04:37:31.387455Z
K 7
svn:log
V 634
MFC r327674, r327796

Introduce mallocarray() in the kernel

Similar to calloc() the mallocarray() function checks for integer
overflows before allocating memory.
It does not zero memory, unless the M_ZERO flag is set.

Additionally, move the overflow check logic out to WOULD_OVERFLOW() for
consumers to have a common means of testing for overflowing allocations.
WOULD_OVERFLOW() should be a secondary check -- on 64-bit platforms, just
because an allocation won't overflow size_t does not mean it is a sane size
to request.  Callers should be imposing reasonable allocation limits far,
far, below overflow.

Obtained from:	OpenBSD

END