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Port r183666 to identify_magic.
It will be tested in the next commit which moves another user to identify_magic. Original message: Fix an out of bounds array access. We were looking at Magic[5] without checking Length. Since this path would not return unless Length >= 18 anyway, just move the >= 18 check up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183753 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -788,11 +788,12 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result) {
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break;
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case '\177':
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if (Magic[1] == 'E' && Magic[2] == 'L' && Magic[3] == 'F') {
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if (Magic.size() >= 18 && Magic[1] == 'E' && Magic[2] == 'L' &&
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Magic[3] == 'F') {
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bool Data2MSB = Magic[5] == 2;
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unsigned high = Data2MSB ? 16 : 17;
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unsigned low = Data2MSB ? 17 : 16;
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if (Magic.size() >= 18 && Magic[high] == 0)
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if (Magic[high] == 0)
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switch (Magic[low]) {
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default: break;
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case 1: return file_magic::elf_relocatable;
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