[PATCH 0/1] MR621: kernelbase: Don't assume the length of the process image name.

[Tim Clem (＠tclem)]

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.

[PATCH 1/1] kernelbase: Don't assume the length of the process image name.

[Tim Clem]

From: Tim Clem

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.
---
 dlls/kernelbase/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/kernelbase/debug.c b/dlls/kernelbase/debug.c
index 9e954e3ffbe..cd8e0d7f87d 100644
--- 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];