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Date: Mon, 18 Oct 2021 15:24:45 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Ziyang Xuan <william.xuanziyang@...wei.com>, Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>, Jakub Kicinski <kuba@...nel.org> Subject: [PATCH 4.19 38/50] nfc: fix error handling of nfc_proto_register() From: Ziyang Xuan <william.xuanziyang@...wei.com> commit 0911ab31896f0e908540746414a77dd63912748d upstream. When nfc proto id is using, nfc_proto_register() return -EBUSY error code, but forgot to unregister proto. Fix it by adding proto_unregister() in the error handling case. Fixes: c7fe3b52c128 ("NFC: add NFC socket family") Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> Link: https://lore.kernel.org/r/20211013034932.2833737-1-william.xuanziyang@huawei.com Signed-off-by: Jakub Kicinski <kuba@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/nfc/af_nfc.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/nfc/af_nfc.c +++ b/net/nfc/af_nfc.c @@ -72,6 +72,9 @@ int nfc_proto_register(const struct nfc_ proto_tab[nfc_proto->id] = nfc_proto; write_unlock(&proto_tab_lock); + if (rc) + proto_unregister(nfc_proto->proto); + return rc; } EXPORT_SYMBOL(nfc_proto_register);
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