[PATCH 5.10.y] nfc: nci: fix uninit-value in the RF discover/activated NTF handlers

[Sasha Levin <sashal@kernel.org>]

From: Samuel Page <sam@bynar.io>

[ Upstream commit 8cbe06c1e699c0a165dae5093a2550e65f914818 ]

nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each
parse a notification into an on-stack struct (nci_rf_discover_ntf /
nci_rf_intf_activated_ntf) that is not initialised. The RF
technology-specific parameters are only extracted when
rf_tech_specific_params_len is non-zero, so a notification that reports a
zero length leaves the rf_tech_specific_params union uninitialised - and
both handlers then pass it to nci_add_new_protocol(), which reads it:

 - discover:  nci_add_new_target() -> nci_add_new_protocol();
 - activated: nci_target_auto_activated() -> nci_add_new_protocol().

nci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch
condition and a memcpy() length and copies nfcid1/sens_res/sel_res into
ndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET.

  BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0
   nci_add_new_protocol+0x624/0x6c0
   nci_ntf_packet+0x25b2/0x3c30
   nci_rx_work+0x318/0x5d0
   process_scheduled_works+0x84b/0x17a0
   worker_thread+0xc10/0x11b0
   kthread+0x376/0x500
  Local variable ntf.i created at:
   nci_ntf_packet+0xbc2/0x3c30

Zero-initialise both on-stack notifications so the union reads back as
zero when no technology-specific parameters are present.

Fixes: 019c4fbaa790 ("NFC: Add NCI multiple targets support")
Fixes: e8c0dacd9836 ("NFC: Update names and structs to NCI spec 1.0 d18")
Link: https://lore.kernel.org/netdev/20260623172109.1105965-2-horms@kernel.org/
Cc: stable@vger.kernel.org
Assisted-by: Bynario AI
Signed-off-by: Samuel Page <sam@bynar.io>
Link: https://patch.msgid.link/20260626090301.2139500-1-sam@bynar.io
Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/nfc/nci/ntf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c
index f8b20cddd5c96..a3d9cb70f3d2c 100644
--- a/net/nfc/nci/ntf.c
+++ b/net/nfc/nci/ntf.c
@@ -310,7 +310,7 @@ void nci_clear_target_list(struct nci_dev *ndev)
 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
 				       struct sk_buff *skb)
 {
-	struct nci_rf_discover_ntf ntf;
+	struct nci_rf_discover_ntf ntf = {};
 	__u8 *data = skb->data;
 	bool add_target = true;
 
@@ -511,7 +511,7 @@ static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
 					     struct sk_buff *skb)
 {
 	struct nci_conn_info    *conn_info;
-	struct nci_rf_intf_activated_ntf ntf;
+	struct nci_rf_intf_activated_ntf ntf = {};
 	__u8 *data = skb->data;
 	int err = NCI_STATUS_OK;
 
-- 
2.53.0