[compiler-rt] bb2e468 - [TSan] [Darwin] Fix off by one in TSAN init due to MemoryRangeIsAvailable (#169008)

[via llvm-commits]

Author: Andrew Haberlandt
Date: 2025-11-21T07:47:11-08:00
New Revision: bb2e4686c1c8e4955ff5d18a7baaef3fe14ba36e

URL: https://github.com/llvm/llvm-project/commit/bb2e4686c1c8e4955ff5d18a7baaef3fe14ba36e
DIFF: https://github.com/llvm/llvm-project/commit/bb2e4686c1c8e4955ff5d18a7baaef3fe14ba36e.diff

LOG: [TSan] [Darwin] Fix off by one in TSAN init due to MemoryRangeIsAvailable (#169008)

Added: 
    

Modified: 
    compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp b/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
index f6fe2405254e7..da735fba663aa 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
@@ -235,7 +235,7 @@ void InitializePlatformEarly() {
   }
   // In some configurations, the max_vm is expanded, but much of this space is
   // already mapped. TSAN will not work in this configuration.
-  if (!MemoryRangeIsAvailable(HiAppMemEnd() - 1, HiAppMemEnd())) {
+  if (!MemoryRangeIsAvailable(HiAppMemEnd() - 1, HiAppMemEnd() - 1)) {
     Report(
         "ThreadSanitizer: Unsupported virtual memory layout: Address %p is "
         "already mapped.\n",