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src: Check the filesize before calling mmap()

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This commit is contained in:
Frank LENORMAND 2019-11-26 13:26:31 +01:00
parent fc9e0e8c6a
commit 7a384edeb0
1 changed files with 2 additions and 3 deletions
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src/file.cc
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@ -217,13 +217,12 @@ MappedFile::MappedFile(StringView filename)
if (st.st_size == 0) if (st.st_size == 0)
return; return;
else if (st.st_size > std::numeric_limits<int>::max())
throw runtime_error("file is too big");
data = (const char*)mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); data = (const char*)mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (data == MAP_FAILED) if (data == MAP_FAILED)
throw file_access_error{filename, strerror(errno)}; throw file_access_error{filename, strerror(errno)};
if (st.st_size > std::numeric_limits<int>::max())
throw runtime_error("file is too big");
} }
MappedFile::~MappedFile() MappedFile::~MappedFile()