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[Support/PathV2] Fix out of bounds access in identify_magic when the file is empty.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158704 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer 2012-06-19 05:29:57 +00:00
parent bde801b2a7
commit b51c8e9bb5
1 changed files with 2 additions and 0 deletions
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lib/Support/PathV2.cpp
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@ -744,6 +744,8 @@ error_code has_magic(const Twine &path, const Twine &magic, bool &result) {
/// @brief Identify the magic in magic.
file_magic identify_magic(StringRef magic) {
if (magic.size() < 4)
return file_magic::unknown;
switch ((unsigned char)magic[0]) {
case 0xDE: // 0x0B17C0DE = BC wraper
if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 &&