diff options
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 7b0a100e1139..39d8d1fc5c2b 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -701,6 +701,21 @@ static void __io_cqring_overflow_flush(struct io_ring_ctx *ctx) memcpy(cqe, &ocqe->cqe, cqe_size); list_del(&ocqe->list); kfree(ocqe); + + /* + * For silly syzbot cases that deliberately overflow by huge + * amounts, check if we need to resched and drop and + * reacquire the locks if so. Nothing real would ever hit this. + * Ideally we'd have a non-posting unlock for this, but hard + * to care for a non-real case. + */ + if (need_resched()) { + io_cq_unlock_post(ctx); + mutex_unlock(&ctx->uring_lock); + cond_resched(); + mutex_lock(&ctx->uring_lock); + io_cq_lock(ctx); + } } if (list_empty(&ctx->cq_overflow_list)) { |