io_uring: fix invalid hybrid polling ctx leaks

It has already allocated the ctx by the point where it checks the hybrid
poll configuration, plain return leaks the memory.

Fixes: 01ee194 ("io_uring: add support for hybrid IOPOLL")
Signed-off-by: Pavel Begunkov <[email protected]>
Reviewed-by: Anuj Gupta <[email protected]>
Link: https://lore.kernel.org/r/b57f2608088020501d352fcdeebdb949e281d65b.1731468230.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <[email protected]>

Author: isilence

io_uring/io_uring.c

@@ -3616,11 +3616,6 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
 	if (!(ctx->flags & IORING_SETUP_NO_SQARRAY))
 		static_branch_inc(&io_key_has_sqarray);
 
-	/* HYBRID_IOPOLL only valid with IOPOLL */
-	if ((ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_HYBRID_IOPOLL)) ==
-			IORING_SETUP_HYBRID_IOPOLL)
-		return -EINVAL;
-
 	if ((ctx->flags & IORING_SETUP_DEFER_TASKRUN) &&
 	    !(ctx->flags & IORING_SETUP_IOPOLL) &&
 	    !(ctx->flags & IORING_SETUP_SQPOLL))
@@ -3671,6 +3666,11 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
 		ctx->notify_method = TWA_SIGNAL;
 	}
 
+	/* HYBRID_IOPOLL only valid with IOPOLL */
+	if ((ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_HYBRID_IOPOLL)) ==
+			IORING_SETUP_HYBRID_IOPOLL)
+		goto err;
+
 	/*
 	 * For DEFER_TASKRUN we require the completion task to be the same as the
 	 * submission task. This implies that there is only one submitter, so enforce