[PATCH kexec-tools 15/32] arm: fix get_kernel_stext_sym() to close its file

[Pratyush Anand]

On Tue, May 3, 2016 at 3:52 PM, Russell King <rmk at arm.linux.org.uk> wrote:
> Fix get_kernel_stext_sym() so that it closes its file once it's
> finsihed with it - there's no need to leak file descriptors.
>
> Signed-off-by: Russell King <rmk at arm.linux.org.uk>

Reviewed-by: Pratyush Anand <panand at redhat.com>

> ---
>  kexec/arch/arm/crashdump-arm.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/kexec/arch/arm/crashdump-arm.c b/kexec/arch/arm/crashdump-arm.c
> index b523e5f..a390187 100644
> --- a/kexec/arch/arm/crashdump-arm.c
> +++ b/kexec/arch/arm/crashdump-arm.c
> @@ -71,25 +71,34 @@ static unsigned long long get_kernel_stext_sym(void)
>         char sym[128];
>         char line[128];
>         FILE *fp;
> -       unsigned long long vaddr;
> +       unsigned long long vaddr = 0;
>         char type;
>
> -       fp = fopen(kallsyms, "r");      if (!fp) {
> +       fp = fopen(kallsyms, "r");
> +       if (!fp) {
>                 fprintf(stderr, "Cannot open %s\n", kallsyms);
>                 return 0;
>         }
>
>         while(fgets(line, sizeof(line), fp) != NULL) {
> -               if (sscanf(line, "%Lx %c %s", &vaddr, &type, sym) != 3)
> +               unsigned long long addr;
> +
> +               if (sscanf(line, "%Lx %c %s", &addr, &type, sym) != 3)
>                         continue;
> +
>                 if (strcmp(sym, stext) == 0) {
> -                       dbgprintf("kernel symbol %s vaddr = %16llx\n", stext, vaddr);
> -                       return vaddr;
> +                       dbgprintf("kernel symbol %s vaddr = %#llx\n", stext, addr);
> +                       vaddr = addr;
> +                       break;
>                 }
>         }
>
> -       fprintf(stderr, "Cannot get kernel %s symbol address\n", stext);
> -       return 0;
> +       fclose(fp);
> +
> +       if (vaddr == 0)
> +               fprintf(stderr, "Cannot get kernel %s symbol address\n", stext);
> +
> +       return vaddr;
>  }
>
>  static int get_kernel_page_offset(struct kexec_info *info,
> --
> 1.9.1
>