From d1c3ad270328a741fff59792e6f4e93a9b0ba814 Mon Sep 17 00:00:00 2001
From: Vojtech Trefny <vtrefny@redhat.com>
Date: Thu, 20 Aug 2020 12:08:06 +0200
Subject: [PATCH] bitlk: Set sector size to 512 when unknown/zero

Fixes: #584
---
 lib/bitlk/bitlk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/bitlk/bitlk.c b/lib/bitlk/bitlk.c
index d5f3165b..ea3d0c5b 100644
--- a/lib/bitlk/bitlk.c
+++ b/lib/bitlk/bitlk.c
@@ -506,6 +506,11 @@ int BITLK_read_sb(struct crypt_device *cd, struct bitlk_metadata *params)
 	}
 
 	params->sector_size = le16_to_cpu(sig.sector_size);
+	if (params->sector_size == 0) {
+		log_dbg(cd, "Got sector size 0, assuming 512.");
+		params->sector_size = SECTOR_SIZE;
+	}
+
 	if (!(params->sector_size == 512 || params->sector_size == 4096)) {
 		log_err(cd, _("Unsupported sector size %" PRIu16 "."), params->sector_size);
 		r = -EINVAL;