From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C80DC4086A for ; Wed, 9 Sep 2026 00:52:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788915133; cv=none; b=LyPLRok9eNYzqHx+d6ys+PexZZ/xbn7N2SNhtQs1AwfY50vL7HnVgFZvis0o6ensVbTmzdbQFxBLPA1pHEfInShTAIf0Us9YJTwGuAoGf1JzFX2S0faK/gv4UYK9BFpCVBJTE8aT221CIaKH09uwRD6CMsnCc7usUmtM94TGVg0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788915133; c=relaxed/simple; bh=l7uCc0iaBF/oY5EM5Wguz/AnnOgW8FPYDGnqnaPBVBQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jywX+nee8/NCQmCqJPt0ZmVwEN/pG9jTGzJXWxftEUvscaTSKAWHI8X/htzootvYWu3JSX7ZrChgoi3bcY1AbDDQleyBXOMeUfecFvgXMKUQzFY1CASVDGjN/K8id3gYQ6kBhQsg8K7NOQtKmizoCzJMbYFk8L+JxoatKxLj0bY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UaFjlt9P; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UaFjlt9P" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F7481F00A3E; Wed, 9 Sep 2026 00:52:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788915131; bh=0rwyHJJEEbhtuiXfB0n1+PRtbjtYZmUgMiilzrPhGUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UaFjlt9Pa6/WfeVhaluOwaRvPKNydIVmNoDvOoMukNZtUUGt+JmszYV1qTvsGPJ3t 80VYr87D3qdtSqAuTBSIOa29gAFbViBZtcwtfCuZBRVAZTtOnriPioD3IZSexYjEps Jv3vfc1aVTm3ua8SxtdWMmTeOUaGkxHmypZ3wiUjZ0i9Qk5niCtbRGBfQoMnm+2zpu LRZAwuSGULlaFdHkHk9qEBAwRzeXxApCr+OM+srvHoKmNZJNoS1zaVBUrKOM7jOmTB V2/wsmLo9MUxCyb7lXG10ukgPvPq9Wl85OjnJBeR4bEIcGS021CPMpC7TJyqsLyeo4 YlHFLjqXcd20A== From: Sasha Levin To: stable@vger.kernel.org Cc: Chuck Lever , Jeff Layton , Sasha Levin Subject: [PATCH 6.6.y 3/3] svcrdma: Use svc_xprt_put to free listener on create failure Date: Tue, 8 Sep 2026 20:52:08 -0400 Message-ID: <20260909005208.805626-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260909005208.805626-1-sashal@kernel.org> References: <2026090355-carton-stuffy-958f@gregkh> <20260909005208.805626-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chuck Lever [ Upstream commit e346ef7bcb137f50c49f969330ab7dcf64ea1654 ] svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path. Fixes: 4fb8518bdac8 ("sunrpc: Tag svc_xprt with net") Cc: stable@vger.kernel.org Acked-by: Jeff Layton Link: https://patch.msgid.link/20260527-rdma-follow-on-v1-3-1b09bd87b6cd@oracle.com Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- net/sunrpc/xprtrdma/svc_rdma_transport.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index dc7e02ed8894f..d2659446a1111 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -348,7 +348,13 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, listen_id = svc_rdma_create_listen_id(net, sa, cma_xprt); if (IS_ERR(listen_id)) { - kfree(cma_xprt); + /* _svc_xprt_create() acquired one module reference and + * puts it on xpo_create failure. svc_xprt_free() puts + * a second one when the kref drops to zero. Take a + * compensating reference so both puts are balanced. + */ + __module_get(cma_xprt->sc_xprt.xpt_class->xcl_owner); + svc_xprt_put(&cma_xprt->sc_xprt); return ERR_CAST(listen_id); } cma_xprt->sc_cm_id = listen_id; -- 2.53.0