[PATCH] nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
From: Cong Nguyen <hidden>
Date: 2026-09-14 12:11:36
Also in:
lkml, oe-linux-nfc
Subsystem:
networking [general], nfc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Heidelberg, Linus Torvalds
nfc_genl_llc_sdreq() builds a list of TLV nodes while walking nested
netlink attrs, but 3 error paths (nested-attr parse failure, TLV alloc
ENOMEM, nfc_llcp_send_snl_sdreq() failure) all skip freeing what was
already queued.
Route them through a new free_list label, mirroring the SDRES path in
the same file which already does this. Harmless on the success path
too -- send_snl_sdreq() drains the list as it moves nodes, so it's
already empty by the time free_list runs.
Fixes: d9b8d8e19b07 ("NFC: llcp: Service Name Lookup netlink interface")
Assisted-by: Claude:claude-opus-4
Signed-off-by: Cong Nguyen <redacted>
---
net/nfc/netlink.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 0c58824cb150..224bdfa2dd0d 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c@@ -1181,7 +1181,7 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) if (rc != 0) { rc = -EINVAL; - goto put_local; + goto free_list; } if (!sdp_attrs[NFC_SDP_ATTR_URI])
@@ -1200,7 +1200,7 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len); if (sdreq == NULL) { rc = -ENOMEM; - goto put_local; + goto free_list; } tlvs_len += sdreq->tlv_len;
@@ -1215,6 +1215,9 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info) rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len); +free_list: + nfc_llcp_free_sdp_tlv_list(&sdreq_list); + put_local: nfc_llcp_local_put(local);
--
2.25.1