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Re: [PATCH] Mini-OS: use BUG() instead of dereferencing NULL
- To: Juergen Gross <jgross@xxxxxxxx>, minios-devel@xxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 6 Dec 2023 11:34:15 +0000
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- Cc: samuel.thibault@xxxxxxxxxxxx, wl@xxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 06 Dec 2023 11:34:19 +0000
- List-id: Mini-os development list <minios-devel.lists.xenproject.org>
On 06/12/2023 11:30 am, Juergen Gross wrote:
> There are some places using a dereference of NULL to cause a crash.
>
> Use BUG() instead.
>
> Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Wow...
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> lib/xmalloc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/xmalloc.c b/lib/xmalloc.c
> index cc5db11e..2aa07138 100644
> --- a/lib/xmalloc.c
> +++ b/lib/xmalloc.c
> @@ -219,7 +219,7 @@ void xfree(const void *p)
> if(((long)p & PAGE_MASK) != ((long)hdr & PAGE_MASK))
> {
> printk("Header should be on the same page\n");
> - *(int*)0=0;
> + BUG();
> }
>
> /* Merge with other free block, or put in list. */
> @@ -255,7 +255,7 @@ void xfree(const void *p)
> if((((unsigned long)hdr) & (PAGE_SIZE-1)) != 0)
> {
> printk("Bug\n");
> - *(int*)0=0;
> + BUG();
> }
> free_page(hdr);
> }
|
