[PATCH 6.10 056/482] io_uring: fix memory leak when cache init fail

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guixin Liu <kanie@xxxxxxxxxxxxxxxxx>

[ Upstream commit 3a87e264290d71ec86a210ab3e8d23b715ad266d ]

Exit the percpu ref when cache init fails to free the data memory with
in struct percpu_ref.

Fixes: 206aefde4f88 ("io_uring: reduce/pack size of io_ring_ctx")
Signed-off-by: Guixin Liu <kanie@xxxxxxxxxxxxxxxxx>
Reviewed-by: Gabriel Krisman Bertazi <krisman@xxxxxxx>
Link: https://lore.kernel.org/r/20240923100512.64638-1-kanie@xxxxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 io_uring/io_uring.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index c0d8ee0c9786d..ff243f6b51199 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -316,7 +316,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 			    sizeof(struct uring_cache));
 	ret |= io_futex_cache_init(ctx);
 	if (ret)
-		goto err;
+		goto free_ref;
 	init_completion(&ctx->ref_comp);
 	xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1);
 	mutex_init(&ctx->uring_lock);
@@ -344,6 +344,9 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	io_napi_init(ctx);
 
 	return ctx;
+
+free_ref:
+	percpu_ref_exit(&ctx->refs);
 err:
 	io_alloc_cache_free(&ctx->rsrc_node_cache, kfree);
 	io_alloc_cache_free(&ctx->apoll_cache, kfree);
-- 
2.43.0







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