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-rw-r--r--contrib/libc++/src/strstream.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/contrib/libc++/src/strstream.cpp b/contrib/libc++/src/strstream.cpp
index 8cd19e6a353c..518422bd2428 100644
--- a/contrib/libc++/src/strstream.cpp
+++ b/contrib/libc++/src/strstream.cpp
@@ -158,6 +158,8 @@ strstreambuf::overflow(int_type __c)
return int_type(EOF);
streamsize old_size = (epptr() ? epptr() : egptr()) - eback();
streamsize new_size = max<streamsize>(__alsize_, 2*old_size);
+ if (new_size == 0)
+ new_size = __default_alsize;
char* buf = nullptr;
if (__palloc_)
buf = static_cast<char*>(__palloc_(static_cast<size_t>(new_size)));