nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done

mainline inclusion
from mainline-v5.16-rc5
commit 4cd8371a
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9S23J
CVE: CVE-2021-47518

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd8371a234d051f9c9557fcbb1f8c523b1c0d10



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The done() netlink callback nfc_genl_dump_ses_done() should check if
received argument is non-NULL, because its allocation could fail earlier
in dumpit() (nfc_genl_dump_ses()).

Fixes: ac22ac46 ("NFC: Add a GET_SE netlink API")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211209081307.57337-1-krzysztof.kozlowski@canonical.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Luo Gengkun <luogengkun2@huawei.com>