stdlib: fix potential UB and integer overflow with huge allocations using malloc-simple allocator

Two things are fixed by this commit:

1/ It is wrong to allocate an object of size > PTRDIFF_MAX.
It is explained in this thread: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63303

2/ There was a possible integer overflow in both malloc() and memalign() implementations
of stdlib/malloc-simple.
The malloc() integer overflow issue is fixed by the side effect of fixing the PTRDIFF_MAX issue.
The memalign() one is fixed by adding a comparison.

Signed-off-by: Yann Sionneau <yann@sionneau.net>

0 files changed, 0 insertions, 0 deletions