linux-kernel - Re: [PATCH v2] f2fs: use kfree() instead of kvfree() to free superblock data

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Message-ID: <d5462b81-6b32-0810-026f-1c07e166cbc8@huawei.com>
Date:   Tue, 9 Jun 2020 09:22:11 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Denis Efremov <efremov@...ux.com>, Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] f2fs: use kfree() instead of kvfree() to free
 superblock data

Hello Denis,

On 2020/6/8 23:41, Denis Efremov wrote:
> Use kfree() instead of kvfree() to free super in read_raw_super_block()
> because the memory is allocated with kzalloc() in the function.
> Use kfree() instead of kvfree() to free sbi in f2fs_fill_super() and
> f2fs_put_super() because the memory is allocated with kzalloc().
> 
> Fixes: 5222595d093e ("f2fs: use kvmalloc, if kmalloc is failed")
> Signed-off-by: Denis Efremov <efremov@...ux.com>

I found two missing cases, so how about this?

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f3c151169542..f913a63e93f0 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1206,7 +1206,7 @@ static void f2fs_put_super(struct super_block *sb)
 	sb->s_fs_info = NULL;
 	if (sbi->s_chksum_driver)
 		crypto_free_shash(sbi->s_chksum_driver);
-	kvfree(sbi->raw_super);
+	kfree(sbi->raw_super);

 	destroy_device_list(sbi);
 	f2fs_destroy_xattr_caches(sbi);
@@ -1221,7 +1221,7 @@ static void f2fs_put_super(struct super_block *sb)
 #ifdef CONFIG_UNICODE
 	utf8_unload(sbi->s_encoding);
 #endif
-	kvfree(sbi);
+	kfree(sbi);
 }

 int f2fs_sync_fs(struct super_block *sb, int sync)
@@ -3101,7 +3101,7 @@ static int read_raw_super_block(struct f2fs_sb_info *sbi,

 	/* No valid superblock */
 	if (!*raw_super)
-		kvfree(super);
+		kfree(super);
 	else
 		err = 0;

@@ -3779,11 +3779,11 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 #endif
 	kvfree(options);
 free_sb_buf:
-	kvfree(raw_super);
+	kfree(raw_super);
 free_sbi:
 	if (sbi->s_chksum_driver)
 		crypto_free_shash(sbi->s_chksum_driver);
-	kvfree(sbi);
+	kfree(sbi);

 	/* give only one another chance */
 	if (retry_cnt > 0 && skip_recovery) {