tree c03051ed27cef74069d9cf69463f4f3b7e13c606
parent 01553a27989ebcb915bb80dedf9d49b06ed41867
author Yu Shan <shanyu@google.com> 1594072484 -0700
committer Yu Shan <shanyu@google.com> 1595451159 -0700

Fix the overflow checking logic for 32 bit system.

In 32 bit system, we cast a pointer to uint8_t* pointer which is
uint32_t to a pointer to uint64_t and then writes to that pointer
in the safe_add function, which would write 64 bit to a 32 bit
variable, causing overflow.

Test: libavb_host_unittest still passes.
Bug: b/160385944
Merged-In: I5ad617404d4ece190702ecb48c1931fcff1cd88d
Change-Id: Ic511a608c5722526d2b447a1dbec8e66310c4b38