答复: [PATCH] x86/process: Return early on NULL iobm in native_tss_update_io_bitmap()

["Li,Rongqing" <lirongqing@baidu.com>]

> From: Li RongQing <lirongqing@baidu.com>
> 
> When 'iobm' is NULL, native_tss_update_io_bitmap() clears the thread flag
> and invalidates the TSS bitmap, but falls through to subsequent code that
> dereferences 'iobm'.
> 
> Add a missing return statement to prevent a potential kernel NULL pointer
> dereference panic.
> 
> Signed-off-by: Li RongQing <lirongqing@baidu.com>
> ---
>  arch/x86/kernel/process.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index
> 4c718f8..d5cd217 100644
> --- a/arch/x86/kernel/process.c
> +++ b/arch/x86/kernel/process.c
> @@ -486,6 +486,7 @@ void native_tss_update_io_bitmap(void)
>  		if (WARN_ON_ONCE(!iobm)) {
>  			clear_thread_flag(TIF_IO_BITMAP);
>  			native_tss_invalidate_io_bitmap();
> +			return;
>  		}
> 

Ping
 

[Li,Rongqing] 


>  		/*
> --
> 2.9.4