linux-kernel - [PATCH] io_uring: fix page leak in io_sqe_buffer

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Message-Id: <20250617123940.40113-1-superman.xpt@gmail.com>
Date: Tue, 17 Jun 2025 05:39:40 -0700
From: Penglei Jiang <superman.xpt@...il.com>
To: axboe@...nel.dk
Cc: io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Penglei Jiang <superman.xpt@...il.com>
Subject: [PATCH] io_uring: fix page leak in io_sqe_buffer_register()

Add missing unpin_user_pages() in the error path

Fixes: d8c2237d0aa9 ("io_uring: add io_pin_pages() helper")
Signed-off-by: Penglei Jiang <superman.xpt@...il.com>
---
 io_uring/rsrc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index c592ceace97d..f5ac1b530e21 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -804,8 +804,10 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
 	}
 
 	imu = io_alloc_imu(ctx, nr_pages);
-	if (!imu)
+	if (!imu) {
+		unpin_user_pages(pages, nr_pages);
 		goto done;
+	}
 
 	imu->nr_bvecs = nr_pages;
 	ret = io_buffer_account_pin(ctx, pages, nr_pages, imu, last_hpage);
-- 
2.17.1