From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Date: Thu, 9 Dec 2021 08:13:07 +0000 (+0100)
Subject: nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done
X-Git-Tag: accepted/tizen/unified/20230118.172025~4417
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fae9705d281091254d4a81fa2da9d22346097dca;p=platform%2Fkernel%2Flinux-rpi.git

nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done

commit 4cd8371a234d051f9c9557fcbb1f8c523b1c0d10 upstream.

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: ac22ac466a65 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 49089c5..082085c 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1392,8 +1392,10 @@ static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
 {
 	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 
-	nfc_device_iter_exit(iter);
-	kfree(iter);
+	if (iter) {
+		nfc_device_iter_exit(iter);
+		kfree(iter);
+	}
 
 	return 0;
 }