From 33d96adbceb22637b2cff79b9144567dfb2888f7 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Wed, 26 Aug 2026 20:59:56 +0200
Subject: [PATCH] Validate that the total disk buffer memory does not exceed
 256 MiB

---
 cmdline/state.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/cmdline/state.c b/cmdline/state.c
index cdee4e99..6bd8a842 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -224,6 +224,18 @@ static void state_config_check(struct snapraid_state* state, const char* path, t
 {
 	tommy_node* i;
 	unsigned l, s;
+	size_t disk_count;
+
+	/* check total memory budget for block buffers (max 256 MiB) */
+	disk_count = tommy_list_count(&state->disklist) + state->level;
+	if (disk_count > (256 * 1024) / (state->block_size / KIBI)) {
+		/* LCOV_EXCL_START */
+		log_fatal(EUSER, "The combination of %zu disks and %u KiB 'blocksize' in '%s' exceeds the 256 MiB limit.\n",
+			disk_count, state->block_size / KIBI, path);
+		log_fatal(EUSER, "Please reduce the 'blocksize' or the number of disks.\n");
+		exit(EXIT_FAILURE);
+		/* LCOV_EXCL_STOP */
+	}
 
 	/* check for parity level */
 	if (state->raid_mode == RAID_MODE_VANDERMONDE_RAID) {