diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index f7128ae7b949cead57ee0b2a7f4450908587dfd2..bb2958ad8a6fa6a44b0b1e127a11f36bde0bff3a 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -118,6 +118,11 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	msblk = sb->s_fs_info;
 
 	msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
+	if (!msblk->devblksize) {
+		errorf(fc, "squashfs: unable to set blocksize\n");
+		return -EINVAL;
+	}
+
 	msblk->devblksize_log2 = ffz(~msblk->devblksize);
 
 	mutex_init(&msblk->meta_index_mutex);