stable inclusion from stable-v4.19.213 commit 9881b0c860649f27ef2565deef011e516390f416 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RBHJ CVE: CVE-2021-47443

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commit 58e7dcc9ca29c14e44267a4d0ea61e3229124907 upstream.

'params' is allocated in digital_tg_listen_mdaa(), but not free when digital_send_cmd() failed, which will cause memory leak. Fix it by freeing 'params' if digital_send_cmd() return failed.

Fixes: 1c7a4c24fbfd ("NFC Digital: Add target NFC-DEP support") Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com Reviewed-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com --- net/nfc/digital_core.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c index ec0a8998e52d..d6258638a07a 100644 --- a/net/nfc/digital_core.c +++ b/net/nfc/digital_core.c @@ -286,6 +286,7 @@ int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) { struct digital_tg_mdaa_params *params; + int rc;

params = kzalloc(sizeof(*params), GFP_KERNEL); if (!params) @@ -300,8 +301,12 @@ static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); params->sc = DIGITAL_SENSF_FELICA_SC;

- return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, - 500, digital_tg_recv_atr_req, NULL); + rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, + 500, digital_tg_recv_atr_req, NULL); + if (rc) + kfree(params); + + return rc; }

static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)