Re: [PATCH-for-5.0] qga-posix: Avoid crashing process when failing to allocate memory

[Dietmar Maurer <dietmar@proxmox.com>]

but error_setg() also calls malloc, so this does not help at all?

> On March 24, 2020 8:48 PM Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
> 
>  
> Similarly to commit 807e2b6fce0 for Windows, kindly return a
> QMP error message instead of crashing the whole process.
> 
> Cc: qemu-stable@nongnu.org
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1594054
> Reported-by: Fakhri Zulkifli <mohdfakhrizulkifli@gmail.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  qga/commands-posix.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/qga/commands-posix.c b/qga/commands-posix.c
> index 93474ff770..8f127788e6 100644
> --- a/qga/commands-posix.c
> +++ b/qga/commands-posix.c
> @@ -493,7 +493,13 @@ struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
>          gfh->state = RW_STATE_NEW;
>      }
>  
> -    buf = g_malloc0(count+1);
> +    buf = g_try_malloc0(count + 1);
> +    if (!buf) {
> +        error_setg(errp,
> +                   "failed to allocate sufficient memory "
> +                   "to complete the requested service");
> +        return NULL;
> +    }
>      read_count = fread(buf, 1, count, fh);
>      if (ferror(fh)) {
>          error_setg_errno(errp, errno, "failed to read file");
> -- 
> 2.21.1