[compiler-rt] b93629d - Address D100645 comment

[Vitaly Buka via llvm-commits]

Author: Vitaly Buka
Date: 2021-04-16T11:28:41-07:00
New Revision: b93629dd335ffee2fc4b9b619bf86c3f9e6b0023

URL: https://github.com/llvm/llvm-project/commit/b93629dd335ffee2fc4b9b619bf86c3f9e6b0023
DIFF: https://github.com/llvm/llvm-project/commit/b93629dd335ffee2fc4b9b619bf86c3f9e6b0023.diff

LOG: Address D100645 comment

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
index 2b10bdd37293..7ff48c35851e 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
@@ -180,10 +180,9 @@ void SetAlternateSignalStack() {
   // TODO(glider): the mapped stack should have the MAP_STACK flag in the
   // future. It is not required by man 2 sigaltstack now (they're using
   // malloc()).
-  void *base = MmapOrDie(GetAltStackSize(), __func__);
-  altstack.ss_sp = (char*) base;
-  altstack.ss_flags = 0;
   altstack.ss_size = GetAltStackSize();
+  altstack.ss_sp = (char *)MmapOrDie(altstack.ss_size, __func__);
+  altstack.ss_flags = 0;
   CHECK_EQ(0, sigaltstack(&altstack, nullptr));
 }