On Fri, Apr 19, 2024 at 3:47 PM hexue wrote:
> +void init_hybrid_poll_info(struct io_ring_ctx *ctx, struct io_kiocb *req)
> +{
> + u32 index;
> +
> + index = req->file->f_inode->i_rdev;
> + struct iopoll_info *entry = xa_load(&ctx->poll_array, index);
> +
> + if (!entry) {
> + entry = kmalloc(sizeof(struct iopoll_info), GFP_KERNEL);
> + entry->last_runtime = 0;
> + entry->last_irqtime = 0;
> + xa_store(&ctx->poll_array, index, entry, GFP_KERNEL);
> + }
GFP_KERNEL may fail; you must check for failure. Otherwise, it could
lead to NULL pointer dereference.
--
Ammar Faizi
