From 77cdb40423e29a5f9d1318cd0ada874ee1916450 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Tue, 12 Aug 2014 15:33:19 +0200 Subject: [PATCH 46/74] unhook_system_services: bail on systab == NULL Prevent unhook_system_services() from dereferencing a NULL systab, which may occur if hook_system_services() has never been called. Signed-off-by: Ard Biesheuvel --- replacements.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/replacements.c b/replacements.c index 48dc437..5dfa355 100644 --- a/replacements.c +++ b/replacements.c @@ -70,6 +70,9 @@ static EFI_HANDLE last_loaded_image; void unhook_system_services(void) { + if (!systab) + return; + systab->BootServices->Exit = system_exit; systab->BootServices->LoadImage = system_load_image; systab->BootServices->StartImage = system_start_image; -- 1.9.3