[llvm-commits] [llvm] r158704 - /llvm/trunk/lib/Support/PathV2.cpp

[Michael J. Spencer]

Author: mspencer
Date: Tue Jun 19 00:29:57 2012
New Revision: 158704

URL: http://llvm.org/viewvc/llvm-project?rev=158704&view=rev
Log:
[Support/PathV2] Fix out of bounds access in identify_magic when the file is empty.

Modified:
    llvm/trunk/lib/Support/PathV2.cpp

Modified: llvm/trunk/lib/Support/PathV2.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/PathV2.cpp?rev=158704&r1=158703&r2=158704&view=diff
==============================================================================
--- llvm/trunk/lib/Support/PathV2.cpp (original)
+++ llvm/trunk/lib/Support/PathV2.cpp Tue Jun 19 00:29:57 2012
@@ -744,6 +744,8 @@
 
 /// @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 &&