Re: [Qemu-devel] [PATCH v3 19/21] vpc: Handle failure for potentially large allocations

["Benoît Canet" <benoit.canet@irqsave.net>]

The Tuesday 03 Jun 2014 à 15:11:00 (+0200), Kevin Wolf wrote :
> Some code in the block layer makes potentially huge allocations. Failure
> is not completely unexpected there, so avoid aborting qemu and handle
> out-of-memory situations gracefully.
> 
> This patch addresses the allocations in the vpc block driver.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  block/vpc.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/block/vpc.c b/block/vpc.c
> index 2e25f57..a6346bb 100644
> --- a/block/vpc.c
> +++ b/block/vpc.c
> @@ -269,7 +269,11 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
>              goto fail;
>          }
>  
> -        s->pagetable = qemu_blockalign(bs, s->max_table_entries * 4);
> +        s->pagetable = qemu_try_blockalign(bs, s->max_table_entries * 4);
> +        if (s->pagetable == NULL) {
> +            ret = -ENOMEM;
> +            goto fail;
> +        }
>  
>          s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
>  
> -- 
> 1.8.3.1
> 
> 
Reviewed-by: Benoit Canet <benoit@irqsave.net>