1 files changed, 4 insertions, 0 deletions

diff --git a/net/nfc/llcp_commands.c b/net/nfc/llcp_commands.c
index 367d8c027101..2ceefa183cee 100644
--- a/net/nfc/llcp_commands.c
+++ b/net/nfc/llcp_commands.c
@@ -149,6 +149,10 @@ struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
 
         pr_debug("uri: %s, len: %zu\n", uri, uri_len);
 
+        /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */
+        if (WARN_ON_ONCE(uri_len > U8_MAX - 4))
+                return NULL;
+
         sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
         if (sdreq == NULL)
                 return NULL;