From c449a181a6988cc1e8dc8764d23574e48cdc3fa6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Veronika=20Hanul=C3=ADkov=C3=A1?= <vhanulik@redhat.com>
Date: Mon, 19 Jun 2023 16:14:51 +0200
Subject: [PATCH] pkcs15-cflex: check path length to prevent underflow

Thanks OSS-Fuzz
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58932
---
 src/pkcs15init/pkcs15-cflex.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pkcs15init/pkcs15-cflex.c b/src/pkcs15init/pkcs15-cflex.c
index d06568073d..ce1d48e62c 100644
--- a/src/pkcs15init/pkcs15-cflex.c
+++ b/src/pkcs15init/pkcs15-cflex.c
@@ -56,6 +56,9 @@ cflex_delete_file(sc_profile_t *profile, sc_pkcs15_card_t *p15card, sc_file_t *d
         int             r = 0;
         /* Select the parent DF */
         path = df->path;
+		if (path.len < 2) {
+			return SC_ERROR_INVALID_ARGUMENTS;
+		}
         path.len -= 2;
         r = sc_select_file(p15card->card, &path, &parent);
         if (r < 0)
