https://bugs.llvm.org/show_bug.cgi?id=34108
Bug ID: 34108
Summary: Invalid pointer from COFFObjectFile::getLoadConfig32()
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
When trying to access the load config of a COFF file, the getter functions
getLoadConfig32 / getLoadConfig64 will return a uninitialized pointer
(COFFObjectFile::LoadConfig). During parsing in
COFFObjectFile::initLoadConfigPtr this pointer will remain uninitialized if
there is a failure to parse this directory. For example if the directory
exists but it does not have a valid size / vaddr.
If this pointer defaulted to nullptr then it could be checked by the caller.
Currently a caller needs to manually confirm that a load_config directory
exists and that its vaddr does not equal 0x0.
I have an example binary that expresses this but unfortunately is too large to
attach. I can provide it if needed.
Output from python's pefile module when run against the testcase:
<snip>
[IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG]
0x1A0 0x0 VirtualAddress: 0x0
0x1A4 0x4 Size: 0x0
<snip>
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