linux-kernel - [PATCH] f2fs crypto: avoid unneeded memory allocation in ->readdir

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Sun, 28 Aug 2016 22:00:12 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs crypto: avoid unneeded memory allocation in ->readdir

From: Chao Yu <yuchao0@...wei.com>

When decrypting dirents in ->readdir, fscrypt_fname_disk_to_usr won't
change content of original encrypted dirent, we don't need to allocate
additional buffer for storing mirror of it, so get rid of it.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/dir.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 3522f6f..fbc8ede 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -796,16 +796,9 @@ bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 			int save_len = fstr->len;
 			int ret;
 
-			de_name.name = f2fs_kmalloc(de_name.len, GFP_NOFS);
-			if (!de_name.name)
-				return false;
-
-			memcpy(de_name.name, d->filename[bit_pos], de_name.len);
-
 			ret = fscrypt_fname_disk_to_usr(d->inode,
 						(u32)de->hash_code, 0,
 						&de_name, fstr);
-			kfree(de_name.name);
 			if (ret < 0)
 				return true;
 
-- 
2.7.2