From 726cf8a5156d5ecd7e7aaed883f9899c69073f18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Wed, 17 Jun 2026 19:41:57 +0200
Subject: [PATCH] secugen: Protect against invalid fw_data

This fixes an issue detected by scan build
---
 libfprint/drivers/secugen.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libfprint/drivers/secugen.c b/libfprint/drivers/secugen.c
index 5299c190..36246010 100644
--- a/libfprint/drivers/secugen.c
+++ b/libfprint/drivers/secugen.c
@@ -636,6 +636,12 @@ init_fw_read_cb (FpiUsbTransfer *transfer,
   else
     {
       /* All FW data received - extract image processing parameters */
+      if (!self->fw_data)
+        {
+          fp_warn ("FW data buffer missing; skipping calibration extraction");
+          fpi_ssm_next_state (transfer->ssm);
+          return;
+        }
 
       /* BLC region offsets: 16 × int16 at fw_data[0x0e] */
       if (self->fw_data_len >= SECUGEN_BLC_OFFSETS_FW + 32)