Merge: zram: fix NULL pointer in comp_algorithm_show()

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/879

zram: fix NULL pointer in comp_algorithm_show()

JIRA: https://issues.redhat.com/browse/RHEL-77764

CVE: CVE-2024-53222

Signed-off-by: Ming Lei <ming.lei@redhat.com>

Approved-by: Maurizio Lombardi <mlombard@redhat.com>
Approved-by: Chris Leech <cleech@redhat.com>
Approved-by: Jeff Moyer <jmoyer@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: CKI GitLab Kmaint Pipeline Bot <26919896-cki-kmaint-pipeline-bot@users.noreply.gitlab.com>

Author: CKI KWF Bot

drivers/block/zram/zram_drv.c

@@ -2382,15 +2382,15 @@ static int zram_add(void)
 	zram->disk->private_data = zram;
 	snprintf(zram->disk->disk_name, 16, "zram%d", device_id);
 
+	zram_comp_params_reset(zram);
+	comp_algorithm_set(zram, ZRAM_PRIMARY_COMP, default_compressor);
+
 	/* Actual capacity set using sysfs (/sys/block/zram<id>/disksize */
 	set_capacity(zram->disk, 0);
 	ret = device_add_disk(NULL, zram->disk, zram_disk_groups);
 	if (ret)
 		goto out_cleanup_disk;
 
-	zram_comp_params_reset(zram);
-	comp_algorithm_set(zram, ZRAM_PRIMARY_COMP, default_compressor);
-
 	zram_debugfs_register(zram);
 	pr_info("Added device: %s\n", zram->disk->disk_name);
 	return device_id;