integrity: print debug message if superblock metadata read fails.

mbroz · Oct 8, 2024 · 443a555 · 443a555
1 parent 79ef5be
commit 443a555
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/lib/integrity/integrity.c b/lib/integrity/integrity.c
@@ -36,8 +36,12 @@ static int INTEGRITY_read_superblock(struct crypt_device *cd,
 		return -EINVAL;
 
 	if (read_lseek_blockwise(devfd, device_block_size(cd, device),
-	    device_alignment(device), sb, sizeof(*sb), offset) != sizeof(*sb) ||
-	    memcmp(sb->magic, SB_MAGIC, sizeof(sb->magic))) {
+	    device_alignment(device), sb, sizeof(*sb), offset) != sizeof(*sb)) {
+		log_dbg(cd, "Cannot read kernel dm-integrity metadata on %s.", device_path(device));
+		return -EINVAL;
+	}
+
+	if (memcmp(sb->magic, SB_MAGIC, sizeof(sb->magic))) {
 		log_dbg(cd, "No kernel dm-integrity metadata detected on %s.", device_path(device));
 		r = -EINVAL;
 	} else if (sb->version < SB_VERSION_1 || sb->version > SB_VERSION_5) {