[PATCH 2/3] io_uring/rsrc: use io_cache_free for node in io_buffer_register_bvec error path

[KobaK]

From: Koba Ko <kobak@xxxxxxxxxx>

io_buffer_register_bvec() allocates the rsrc node via
io_rsrc_node_alloc() which pulls from ctx->node_cache. On imu allocation
failure, the node is freed with raw kfree() instead of
io_cache_free(&ctx->node_cache, node), bypassing the cache return path
and wasting a reuse opportunity. Every other error path in this file
correctly uses io_cache_free for nodes.

Fixes: 27cb27b6d5ea4 ("io_uring: add support for kernel registered bvecs")
Signed-off-by: Koba Ko <kobak@xxxxxxxxxx>
---
 io_uring/rsrc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 1b96ab5e98c99..6f46cf9cd13d7 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -961,7 +961,7 @@ int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq,
 	 */
 	imu = io_alloc_imu(ctx, blk_rq_nr_phys_segments(rq));
 	if (!imu) {
-		kfree(node);
+		io_cache_free(&ctx->node_cache, node);
 		ret = -ENOMEM;
 		goto unlock;
 	}
-- 
2.43.0