[PATCH 7.2.y] io_uring/kbuf: don't charge provided buffer rings to RLIMIT_MEMLOCK

[Sasha Levin <sashal@kernel.org>]

From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit cde56daf4b93f474dc256dbcc5205035223ae6f5 ]

Just like with the SQ and CQ rings, the provided buffer rings were also
not charged against the memlock limit prior to the below mentioned
commit. Restore that behavior.

Fixes: ef62de3c4ad5 ("io_uring/kbuf: use region api for pbuf rings")
Reported-by: Hengyu Liang <hengyul@cs.unc.edu>
Cc: stable@vger.kernel.org
Tested-by: Hengyu Liang <hengyul@cs.unc.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Depends on <20261012153857.1014795-1-sashal@kernel.org>

 io_uring/kbuf.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index d2fb952bb7ab6..5065a3eff8094 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -458,7 +458,7 @@ static int io_remove_buffers_legacy(struct io_ring_ctx *ctx,
 static void io_put_bl(struct io_ring_ctx *ctx, struct io_buffer_list *bl)
 {
 	if (bl->flags & IOBL_BUF_RING)
-		io_free_region(ctx->user, &bl->region);
+		io_free_region(NULL, &bl->region);
 	else
 		io_remove_buffers_legacy(ctx, bl, -1U);
 
@@ -675,7 +675,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
 		rd.user_addr = reg.ring_addr;
 		rd.flags |= IORING_MEM_REGION_TYPE_USER;
 	}
-	ret = io_create_region(ctx->user, &bl->region, &rd, mmap_offset);
+	ret = io_create_region(NULL, &bl->region, &rd, mmap_offset);
 	if (ret)
 		goto fail;
 	br = io_region_get_ptr(&bl->region);
@@ -708,7 +708,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
 	if (!ret)
 		return 0;
 fail:
-	io_free_region(ctx->user, &bl->region);
+	io_free_region(NULL, &bl->region);
 	kfree(bl);
 	return ret;
 }
-- 
2.53.0