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ext2: ensure fast symlinks are NUL-terminated 

Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.

Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Duane Griffin 2008-12-19 20:47:13 +00:00 committed by Al Viro
parent ebd09abbd9
commit 8d6d0c4da2
1 changed files with 5 additions and 2 deletions
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7
fs/ext2/inode.c
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@ -32,6 +32,7 @@
#include <linux/buffer_head.h> #include <linux/buffer_head.h>
#include <linux/mpage.h> #include <linux/mpage.h>
#include <linux/fiemap.h> #include <linux/fiemap.h>
#include <linux/namei.h>
#include "ext2.h" #include "ext2.h"
#include "acl.h" #include "acl.h"
#include "xip.h" #include "xip.h"
@ -1286,9 +1287,11 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
else else
inode->i_mapping->a_ops = &ext2_aops; inode->i_mapping->a_ops = &ext2_aops;
} else if (S_ISLNK(inode->i_mode)) { } else if (S_ISLNK(inode->i_mode)) {
if (ext2_inode_is_fast_symlink(inode)) if (ext2_inode_is_fast_symlink(inode)) {
inode->i_op = &ext2_fast_symlink_inode_operations; inode->i_op = &ext2_fast_symlink_inode_operations;
else { nd_terminate_link(ei->i_data, inode->i_size,
sizeof(ei->i_data) - 1);
} else {
inode->i_op = &ext2_symlink_inode_operations; inode->i_op = &ext2_symlink_inode_operations;
if (test_opt(inode->i_sb, NOBH)) if (test_opt(inode->i_sb, NOBH))
inode->i_mapping->a_ops = &ext2_nobh_aops; inode->i_mapping->a_ops = &ext2_nobh_aops;