Re: [Qemu-devel] [PATCH 16/18] hw/pc.c: fix warnings with _FORTIFY_SOURCE

[Blue Swirl <blauwirbel@gmail.com>]

On Sun, Dec 20, 2009 at 1:39 AM, Kirill A. Shutemov
<kirill@shutemov.name> wrote:
>  CC    i386-softmmu/pc.o
> cc1: warnings being treated as errors
> /usr/src/RPM/BUILD/qemu-0.11.92/hw/pc.c: In function 'load_multiboot':
> /usr/src/RPM/BUILD/qemu-0.11.92/hw/pc.c:614: error: ignoring return value of 'fread', declared with attribute warn_unused_result
> /usr/src/RPM/BUILD/qemu-0.11.92/hw/pc.c: In function 'load_linux':
> /usr/src/RPM/BUILD/qemu-0.11.92/hw/pc.c:888: error: ignoring return value of 'fread', declared with attribute warn_unused_result
> /usr/src/RPM/BUILD/qemu-0.11.92/hw/pc.c:889: error: ignoring return value of 'fread', declared with attribute warn_unused_result
> make[1]: *** [pc.o] Error 1
>
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> ---
>  hw/pc.c |   15 ++++++++++++---
>  1 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/hw/pc.c b/hw/pc.c
> index db7d58e..83f8dd0 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -613,7 +613,10 @@ static int load_multiboot(void *fw_cfg,
>
>         mb_kernel_data = qemu_malloc(mb_kernel_size);
>         fseek(f, mb_kernel_text_offset, SEEK_SET);
> -        fread(mb_kernel_data, 1, mb_kernel_size, f);
> +        if (fread(mb_kernel_data, 1, mb_kernel_size, f) != mb_kernel_size) {
> +            fprintf(stderr, "fread() failed\n");
> +            exit(1);
> +        }
>         fclose(f);
>     }
>
> @@ -887,8 +890,14 @@ static void load_linux(void *fw_cfg,
>     setup  = qemu_malloc(setup_size);
>     kernel = qemu_malloc(kernel_size);
>     fseek(f, 0, SEEK_SET);
> -    fread(setup, 1, setup_size, f);
> -    fread(kernel, 1, kernel_size, f);
> +    if (fread(setup, 1, setup_size, f) != setup_size) {
> +        fprintf(stderr, "fread() failed\n");
> +        exit(1);
> +    }
> +    if (fread(kernel, 1, kernel_size, f) != kernel_size) {
> +        fprintf(stderr, "fread() failed\n");
> +        exit(1);
> +    }
>     fclose(f);
>     memcpy(setup, header, MIN(sizeof(header), setup_size));

Looks fine to me. If we can't read the kernel, PEBCAK.