On Tue, Jan 11, 2022 at 03:00:23PM +0800, Jiasheng Jiang wrote:
> As the possible failure of the allocation, the ida_simple_get() will
> return error number.
> And then ctx->id will be printed in eventfd_show_fdinfo().
> Therefore, it should be better to check it and return error if fails,
> like the other allocation.
>
> Fixes: b556db17b0e7 ("eventfd: present id to userspace via fdinfo")
> Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
> ---
> fs/eventfd.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/fs/eventfd.c b/fs/eventfd.c
> index 3627dd7d25db..5ec1d998f3ac 100644
> --- a/fs/eventfd.c
> +++ b/fs/eventfd.c
> @@ -424,6 +424,10 @@ static int do_eventfd(unsigned int count, int flags)
> ctx->count = count;
> ctx->flags = flags;
> ctx->id = ida_simple_get(&eventfd_ida, 0, 0, GFP_KERNEL);
> + if (ctx->id) {
> + fd = ctx->id;
> + goto err;
> + }
Shouldn't this be 'ctx->id < 0'?
- Eric
