linux-kernel - [f2fs-dev] [PATCH 2/2] f2fs: avoid unneeded lookup when xattr name length is too long

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Message-id: <000d01cf459c$68d4e070$3a7ea150$@samsung.com>
Date:	Sat, 22 Mar 2014 14:59:45 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	??? <jaegeuk.kim@...sung.com>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [f2fs-dev] [PATCH 2/2] f2fs: avoid unneeded lookup when xattr name
 length is too long

In f2fs_setxattr we have limit this attribute name length, so we should also
check it in f2fs_getxattr to avoid useless lookup caused by invalid name length.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
 fs/f2fs/xattr.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 0121e45..503c245 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -407,6 +407,8 @@ int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
 	if (name == NULL)
 		return -EINVAL;
 	name_len = strlen(name);
+	if (name_len > F2FS_NAME_LEN)
+		return -ERANGE;
 
 	base_addr = read_all_xattrs(inode, NULL);
 	if (!base_addr)
-- 
1.7.9.5


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