[llvm] r271008 - Validate the blocksize before using it
David Majnemer via llvm-commits
llvm-commits at lists.llvm.org
Fri May 27 08:57:38 PDT 2016
Author: majnemer
Date: Fri May 27 10:57:38 2016
New Revision: 271008
URL: http://llvm.org/viewvc/llvm-project?rev=271008&view=rev
Log:
Validate the blocksize before using it
The blocksize could be zero on disk causing later checks to divide by
zero.
Modified:
llvm/trunk/lib/DebugInfo/PDB/Raw/PDBFile.cpp
Modified: llvm/trunk/lib/DebugInfo/PDB/Raw/PDBFile.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/PDB/Raw/PDBFile.cpp?rev=271008&r1=271007&r2=271008&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/PDB/Raw/PDBFile.cpp (original)
+++ llvm/trunk/lib/DebugInfo/PDB/Raw/PDBFile.cpp Fri May 27 10:57:38 2016
@@ -139,9 +139,10 @@ Error PDBFile::parseFileHeaders() {
return make_error<RawError>(raw_error_code::corrupt_file,
"MSF magic header doesn't match");
- if (BufferRef.getBufferSize() % SB->BlockSize != 0)
+ // We don't support blocksizes which aren't a multiple of four bytes.
+ if (SB->BlockSize % sizeof(support::ulittle32_t) != 0)
return make_error<RawError>(raw_error_code::corrupt_file,
- "File size is not a multiple of block size");
+ "Block size is not multiple of 4.");
switch (SB->BlockSize) {
case 512: case 1024: case 2048: case 4096:
@@ -152,10 +153,9 @@ Error PDBFile::parseFileHeaders() {
"Unsupported block size.");
}
- // We don't support blocksizes which aren't a multiple of four bytes.
- if (SB->BlockSize % sizeof(support::ulittle32_t) != 0)
+ if (BufferRef.getBufferSize() % SB->BlockSize != 0)
return make_error<RawError>(raw_error_code::corrupt_file,
- "Block size is not multiple of 4.");
+ "File size is not a multiple of block size");
// We don't support directories whose sizes aren't a multiple of four bytes.
if (SB->NumDirectoryBytes % sizeof(support::ulittle32_t) != 0)
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