From: Pavel Begunkov <asml.silence@gmail.com>
Date: Sun, 15 Feb 2026 21:29:12 +0000 (+0000)
Subject: io_uring/zcrx: check unsupported flags on import
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=7496e658a76a61758b20e27cea8abcfeafe3aec4;p=linux-2.6-microblaze.git

io_uring/zcrx: check unsupported flags on import

The imoorted zcrx registration path checks for ZCRX_REG_IMPORT, as it
should, but doesn't reject any unsupported flags. Fix that.

Cc: stable@vger.kernel.org
Fixes: 00d91481279fb ("io_uring/zcrx: share an ifq between rings")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index b24d1da2e1ca..dda863e5e8b7 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -677,6 +677,8 @@ static int import_zcrx(struct io_ring_ctx *ctx,
 		return -EINVAL;
 	if (reg->if_rxq || reg->rq_entries || reg->area_ptr || reg->region_ptr)
 		return -EINVAL;
+	if (reg->flags & ~ZCRX_REG_IMPORT)
+		return -EINVAL;
 
 	fd = reg->if_idx;
 	CLASS(fd, f)(fd);