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-rw-r--r--llvm/lib/Support/MemoryBuffer.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index cab45c736b5..1c45c69ff3f 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -276,7 +276,7 @@ static bool shouldUseMmap(int FD,
int PageSize) {
// We don't use mmap for small files because this can severely fragment our
// address space.
- if (MapSize < 4096*4)
+ if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
return false;
if (!RequiresNullTerminator)
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