[compiler-rt] 0a09c1c - [scudo][standalone] Add missing va_end() in ScopedString::append

[Kostya Kortchinsky via llvm-commits]

Author: Kostya Kortchinsky
Date: 2020-12-02T16:10:50-08:00
New Revision: 0a09c1cc9dcbec8126344123e9481bed6524e5ec

URL: https://github.com/llvm/llvm-project/commit/0a09c1cc9dcbec8126344123e9481bed6524e5ec
DIFF: https://github.com/llvm/llvm-project/commit/0a09c1cc9dcbec8126344123e9481bed6524e5ec.diff

LOG:  [scudo][standalone] Add missing va_end() in ScopedString::append

In ScopedString::append va_list ArgsCopy is created but never cleanuped
which can lead to undefined behaviour, like stack corruption.

Reviewed By: cryptoad

Differential Revision: https://reviews.llvm.org/D92383

Added: 
    

Modified: 
    compiler-rt/lib/scudo/standalone/string_utils.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/scudo/standalone/string_utils.cpp b/compiler-rt/lib/scudo/standalone/string_utils.cpp
index 7578123da361..f304491019b2 100644
--- a/compiler-rt/lib/scudo/standalone/string_utils.cpp
+++ b/compiler-rt/lib/scudo/standalone/string_utils.cpp
@@ -222,6 +222,7 @@ void ScopedString::append(const char *Format, va_list Args) {
       static_cast<uptr>(formatString(C, sizeof(C), Format, Args)) + 1;
   String.resize(Length + AdditionalLength);
   formatString(String.data() + Length, AdditionalLength, Format, ArgsCopy);
+  va_end(ArgsCopy);
   Length = strlen(String.data());
   CHECK_LT(Length, String.size());
 }