Re: [Qemu-devel] [PATCH] migration: use g_free for ram load bitmap

[Juan Quintela <quintela@redhat.com>]

Peter Xu <peterx@redhat.com> wrote:
> Buffers allocated with bitmap_new() should be freed with g_free().
>
> Both reported by Coverity:
>
> *** CID 1391300:  API usage errors  (ALLOC_FREE_MISMATCH)
> /migration/ram.c: 3517 in ram_dirty_bitmap_reload()
> 3511          * the last one to sync, we need to notify the main send thread.
> 3512          */
> 3513         ram_dirty_bitmap_reload_notify(s);
> 3514
> 3515         ret = 0;
> 3516     out:
>>>>     CID 1391300:  API usage errors  (ALLOC_FREE_MISMATCH)
>>>>     Calling "free" frees "le_bitmap" using "free" but it should
>>>> have been freed using "g_free".
> 3517         free(le_bitmap);
> 3518         return ret;
> 3519     }
> 3520
> 3521     static int ram_resume_prepare(MigrationState *s, void *opaque)
> 3522     {
>
> *** CID 1391292:  API usage errors  (ALLOC_FREE_MISMATCH)
> /migration/ram.c: 249 in ramblock_recv_bitmap_send()
> 243          * Mark as an end, in case the middle part is screwed up due to
> 244          * some "misterious" reason.
> 245          */
> 246         qemu_put_be64(file, RAMBLOCK_RECV_BITMAP_ENDING);
> 247         qemu_fflush(file);
> 248
>>>>     CID 1391292:  API usage errors  (ALLOC_FREE_MISMATCH)
>>>>     Calling "free" frees "le_bitmap" using "free" but it should
>>>> have been freed using "g_free".
> 249         free(le_bitmap);
> 250
> 251         if (qemu_file_get_error(file)) {
> 252             return qemu_file_get_error(file);
> 253         }
> 254
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  migration/ram.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 5bcbf7a9f9..c53e8369a3 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -246,7 +246,7 @@ int64_t ramblock_recv_bitmap_send(QEMUFile *file,
>      qemu_put_be64(file, RAMBLOCK_RECV_BITMAP_ENDING);
>      qemu_fflush(file);
>  
> -    free(le_bitmap);
> +    g_free(le_bitmap);
>  
>      if (qemu_file_get_error(file)) {
>          return qemu_file_get_error(file);
> @@ -3514,7 +3514,7 @@ int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block)
>  
>      ret = 0;
>  out:
> -    free(le_bitmap);
> +    g_free(le_bitmap);
>      return ret;
>  }

Reviewed-by: Juan Quintela <quintela@redhat.com>

Queued