From: Miklos Szeredi <mszeredi@redhat.com>
Date: Thu, 22 Jul 2021 12:18:14 +0000 (+0200)
Subject: ovl: use kvalloc in xattr copy-up
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f945ca1963c8bd29471020d7c58c594ee7007006;p=linux.git

ovl: use kvalloc in xattr copy-up

Extended attributes are usually small, but could be up to 64k in size, so
use the most efficient method for doing the allocation.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 9d8ebf0e72375..4e7d5bfa2949f 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -63,7 +63,7 @@ int ovl_copy_xattr(struct super_block *sb, struct dentry *old,
 		return list_size;
 	}
 
-	buf = kzalloc(list_size, GFP_KERNEL);
+	buf = kvzalloc(list_size, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
@@ -106,11 +106,12 @@ retry:
 		if (size > value_size) {
 			void *new;
 
-			new = krealloc(value, size, GFP_KERNEL);
+			new = kvmalloc(size, GFP_KERNEL);
 			if (!new) {
 				error = -ENOMEM;
 				break;
 			}
+			kvfree(value);
 			value = new;
 			value_size = size;
 			goto retry;
@@ -125,9 +126,9 @@ retry:
 			error = 0;
 		}
 	}
-	kfree(value);
+	kvfree(value);
 out:
-	kfree(buf);
+	kvfree(buf);
 	return error;
 }