linux-ext4 - [PATCH 23/30] ext2: Use kmemdup rather than duplicating its implementation

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>] [thread-next>] [day] [month] [year] [list]

Date:   Wed,  3 Jul 2019 21:17:27 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH 23/30] ext2: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memset, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memset.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 fs/ext2/xattr.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 1e33e0ac8cf1..a9c641cd5484 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -506,11 +506,10 @@ bad_block:		ext2_error(sb, "ext2_xattr_set",
 
 			unlock_buffer(bh);
 			ea_bdebug(bh, "cloning");
-			header = kmalloc(bh->b_size, GFP_KERNEL);
+			header = kmemdup(HDR(bh), bh->b_size, GFP_KERNEL);
 			error = -ENOMEM;
 			if (header == NULL)
 				goto cleanup;
-			memcpy(header, HDR(bh), bh->b_size);
 			header->h_refcount = cpu_to_le32(1);
 
 			offset = (char *)here - bh->b_data;
-- 
2.11.0