kernelbase: Don't assume the length of the process image name.

NtQueryInformationProcess(ProcessImageFileNameWin32) may return an empty string in some circumstances, which leads QueryFullProcessImageNameW to crash if called with flags including PROCESS_NAME_NATIVE, as that path assumed the image name had a length of at least 2.

kernelbase: Don't assume the length of the process image name.
a7937e83 · Tim Clem · Alexandre Julliard · 88f1d681 · a7937e83
Commit a7937e83 authored Aug 09, 2022 by Tim Clem Committed by Alexandre Julliard Aug 10, 2022
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debug.c dlls/kernelbase/debug.c +1 -1

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--- a/dlls/kernelbase/debug.c
+++ b/dlls/kernelbase/debug.c
@@ -1575,7 +1575,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH QueryFullProcessImageNameW( HANDLE process, DWORD 

    if (status) goto cleanup;

-    if (flags & PROCESS_NAME_NATIVE)
+    if (flags & PROCESS_NAME_NATIVE && result->Length > 2 * sizeof(WCHAR))
    {
        WCHAR drive[3];
        WCHAR device[1024];