From f75827281fe5ec0d28c8661eeb476fa7707e8e6d Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Wed, 26 Aug 2026 14:25:56 +0200
Subject: [PATCH] Reject empty disk filter patterns in filter_alloc_disk

---
 cmdline/elem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmdline/elem.c b/cmdline/elem.c
index 9f650efc..c975575c 100644
--- a/cmdline/elem.c
+++ b/cmdline/elem.c
@@ -127,8 +127,8 @@ struct snapraid_filter* filter_alloc_disk(int direction, const char* pattern)
 	filter->is_abs = 0;
 	filter->is_dir = 0;
 
-	/* no slash allowed in disk names */
-	if (strchr(filter->pattern, '/') != 0) {
+	/* no empty pattern or slash allowed in disk names */
+	if (filter->pattern[0] == 0 || strchr(filter->pattern, '/') != 0) {
 		/* LCOV_EXCL_START */
 		free(filter);
 		return 0;