[klibc] malloc: Fail if requested size > PTRDIFF_MAX
malloc() adds some overhead to the requested size, which may result in
an integer overflow and subsequent buffer overflow if it is close to
SIZE_MAX. It should fail if size is large enough for this to happen.
Further, it's not legal for a C object to be larger than
PTRDIFF_MAX (half of SIZE_MAX) as pointer arithmetic within it could
overflow. So return failure immediately if size is greater than that.
Signed-off-by: Ben Hutchings <email@example.com>
1 file changed