From f0317d788221828089fe54433cf5c502d748ef77 Mon Sep 17 00:00:00 2001
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Tue, 17 Aug 2021 07:11:58 +0200
Subject: [PATCH] kwbimage: check return value of image_get_csk_index
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image_get_csk_index() may return -1 in case of an error. Don't use this
value as index.

This resolves Coverity CID 338488
Memory - illegal accesses  (NEGATIVE_RETURNS)

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
---
 tools/kwbimage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index b269488..aa865cc 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -1087,7 +1087,7 @@ int kwb_sign_csk_with_kak(struct image_tool_params *params,
 	int csk_idx = image_get_csk_index();
 	struct sig_v1 tmp_sig;
 
-	if (csk_idx >= 16) {
+	if (csk_idx < 0 || csk_idx > 15) {
 		fprintf(stderr, "Invalid CSK index %d\n", csk_idx);
 		return 1;
 	}
-- 
2.7.4