releases/5.9.5/btrfs-use-kvzalloc-to-allocate-clone_roots-in-btrfs_ioctl_send.patch

From 8eb2fd00153a3a96a19c62ac9c6d48c2efebe5e8 Mon Sep 17 00:00:00 2001
From: Denis Efremov <efremov@linux.com>
Date: Mon, 21 Sep 2020 20:03:35 +0300
Subject: btrfs: use kvzalloc() to allocate clone_roots in btrfs_ioctl_send()

From: Denis Efremov <efremov@linux.com>

commit 8eb2fd00153a3a96a19c62ac9c6d48c2efebe5e8 upstream.

btrfs_ioctl_send() used open-coded kvzalloc implementation earlier.
The code was accidentally replaced with kzalloc() call [1]. Restore
the original code by using kvzalloc() to allocate sctx->clone_roots.

[1] https://patchwork.kernel.org/patch/9757891/#20529627

Fixes: 818e010bf9d0 ("btrfs: replace opencoded kvzalloc with the helper")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Denis Efremov <efremov@linux.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/send.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -7300,7 +7300,7 @@ long btrfs_ioctl_send(struct file *mnt_f
 
 	alloc_size = sizeof(struct clone_root) * (arg->clone_sources_count + 1);
 
-	sctx->clone_roots = kzalloc(alloc_size, GFP_KERNEL);
+	sctx->clone_roots = kvzalloc(alloc_size, GFP_KERNEL);
 	if (!sctx->clone_roots) {
 		ret = -ENOMEM;
 		goto out;