Merge: mlxsw: spectrum_acl_tcam: Fix memory leak during rehash [rhel-9]

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/4337

JIRA: https://issues.redhat.com/browse/RHEL-37014  
CVE: CVE-2024-35853  

Commits:
```
8ca3f7a ("mlxsw: spectrum_acl_tcam: Fix memory leak during rehash")
```

Signed-off-by: Ivan Vecera <ivecera@redhat.com>

Approved-by: José Ignacio Tornos Martínez <jtornosm@redhat.com>
Approved-by: Petr Oros <poros@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c

@@ -1192,6 +1192,8 @@ mlxsw_sp_acl_tcam_vchunk_migrate_start(struct mlxsw_sp *mlxsw_sp,
 {
 	struct mlxsw_sp_acl_tcam_chunk *new_chunk;
 
+	WARN_ON(vchunk->chunk2);
+
 	new_chunk = mlxsw_sp_acl_tcam_chunk_create(mlxsw_sp, vchunk, region);
 	if (IS_ERR(new_chunk))
 		return PTR_ERR(new_chunk);
@@ -1334,6 +1336,8 @@ mlxsw_sp_acl_tcam_vregion_migrate(struct mlxsw_sp *mlxsw_sp,
 	err = mlxsw_sp_acl_tcam_vchunk_migrate_all(mlxsw_sp, vregion,
 						   ctx, credits);
 	if (err) {
+		if (ctx->this_is_rollback)
+			return err;
 		/* In case migration was not successful, we need to swap
 		 * so the original region pointer is assigned again
 		 * to vregion->region.