pstore updates

- Improve failure paths (chenqiwu)
 - Fix ftrace position index (Vasily Averin)
 - Use proper flexible-array member (Gustavo A. R. Silva)
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Merge tag 'pstore-v5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore updates from Kees Cook:
 "These mostly some minor cleanups and a bug fix for an ftrace corner
  case:

   - Improve failure paths (chenqiwu)

   - Fix ftrace position index (Vasily Averin)

   - Use proper flexible-array member (Gustavo A. R. Silva)"

* tag 'pstore-v5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/ram: Replace zero-length array with flexible-array member
  pstore: pstore_ftrace_seq_next should increase position index
  pstore/ram: remove unnecessary ramoops_unregister_dummy()
  pstore/platform: fix potential mem leak if pstore_init_fs failed

fs/pstore/inode.c

@@ -87,11 +87,11 @@ static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
 	struct pstore_private *ps = s->private;
 	struct pstore_ftrace_seq_data *data = v;
 
+	(*pos)++;
 	data->off += REC_SIZE;
 	if (data->off + REC_SIZE > ps->total_size)
 		return NULL;
 
-	(*pos)++;
 	return data;
 }
 
@@ -101,6 +101,9 @@ static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
 	struct pstore_ftrace_seq_data *data = v;
 	struct pstore_ftrace_record *rec;
 
+	if (!data)
+		return 0;
+
 	rec = (struct pstore_ftrace_record *)(ps->record->buf + data->off);
 
 	seq_printf(s, "CPU:%d ts:%llu %08lx  %08lx  %ps <- %pS\n",

fs/pstore/platform.c

@@ -823,9 +823,9 @@ static int __init pstore_init(void)
 
 	ret = pstore_init_fs();
 	if (ret)
-		return ret;
+		free_buf_for_compression();
 
-	return 0;
+	return ret;
 }
 late_initcall(pstore_init);
 

fs/pstore/ram.c

@@ -963,7 +963,6 @@ static void __init ramoops_register_dummy(void)
 		pr_info("could not create platform device: %ld\n",
 			PTR_ERR(dummy));
 		dummy = NULL;
-		ramoops_unregister_dummy();
 	}
 }
 

fs/pstore/ram_core.c

@@ -34,7 +34,7 @@ struct persistent_ram_buffer {
 	uint32_t    sig;
 	atomic_t    start;
 	atomic_t    size;
-	uint8_t     data[0];
+	uint8_t     data[];
 };
 
 #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */