Re: [PATCH] smbios: Fix buffer overrun when using path= option

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sun, Mar 23, 2025 at 10:35:54PM +0100, Daan De Meyer wrote:
> We have to make sure the array of bytes read from the path= file
> is null-terminated, otherwise we run into a buffer overrun later on.
> 
> Fixes: bb99f4772f54017490e3356ecbb3df25c5d4537f ("hw/smbios: support loading OEM strings values from a file")
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2879
> 
> Signed-off-by: Daan De Meyer <daan.j.demeyer@gmail.com>
> ---
>  hw/smbios/smbios.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
> index 02a09eb9cd..ad4cd6721e 100644
> --- a/hw/smbios/smbios.c
> +++ b/hw/smbios/smbios.c
> @@ -1285,6 +1285,9 @@ static int save_opt_one(void *opaque,
>              g_byte_array_append(data, (guint8 *)buf, ret);
>          }
>  
> +        buf[0] = '\0';
> +        g_byte_array_append(data, (guint8 *)buf, 1);
> +
>          qemu_close(fd);
>  
>          *opt->dest = g_renew(char *, *opt->dest, (*opt->ndest) + 1);

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

With regards,
Daniel
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