aio: prevent double free in ioctx_alloc ioctx_alloc() calls aio_setup_ring() to allocate a ring. If aio_setup_ring() fails to do so it would call aio_free_ring() before returning, but ioctx_alloc() would call aio_free_ring() again causing a double free of the ring. This is easily reproducible from userspace. diff --git a/fs/aio.c b/fs/aio.c index ee77dc1..6313533 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -610,7 +610,6 @@ static struct kioctx *ioctx_alloc(unsigned nr_events) err_cleanup: aio_nr_sub(ctx->max_reqs); err: - aio_free_ring(ctx); free_percpu(ctx->cpu); free_percpu(ctx->reqs.pcpu_count); free_percpu(ctx->users.pcpu_count);