[PATCH 1/1] advapi32: Avoid buffer underrun in split_domain_account (ASan).

[Bernhard Übelacker]

From: Bernhard Übelacker

---
 dlls/advapi32/security.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index fe6ba62d228..b7cb25c5007 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -1210,7 +1210,7 @@ static void split_domain_account( const LSA_UNICODE_STRING *str, LSA_UNICODE_STR

while (p > str->Buffer && *p != '\') p--;

-    if (*p == '\')
+    if (p >= str->Buffer && *p == '\')
     {
         domain->Buffer = str->Buffer;
         domain->Length = (p - str->Buffer) * sizeof(WCHAR);