[compiler-rt] [Sanitizers][Apple] Fix logic bugs that break RestrictMemoryToMaxAddress (PR #124712)

[via llvm-commits]

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@@ -1272,10 +1272,11 @@ uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
     mach_msg_type_number_t count = kRegionInfoSize;
     kr = mach_vm_region_recurse(mach_task_self(), &address, &vmsize, &depth,
                                 (vm_region_info_t)&vminfo, &count);
-    if (kr == KERN_INVALID_ADDRESS) {
+    if (kr == KERN_INVALID_ADDRESS || address > max_vm_address) {
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thetruestblue wrote:

I dont know if this is the case. For this condition we simply finishing checking that iteration. A different return code would probably be more properly handled by not doing that. I also don't know if we would expect different kernel codes in other cases (entitlements?) I would rather do a follow up PR with this change.

https://github.com/llvm/llvm-project/pull/124712