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Date: Mon, 14 Jan 2008 15:15:04 -0600
From: Eric Sandeen <sandeen@...hat.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...l.org>
CC: Roman Zippel <zippel@...ux-m68k.org>
Subject: [PATCH] address hfs on-disk corruption robustness review comments
Address Roman's review comments for the previously sent on-disk
corruption hfs robustness patch.
I still owe a patch for hfsplus.
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
Index: linux-2.6.24-rc6-mm1/fs/hfs/bfind.c
===================================================================
--- linux-2.6.24-rc6-mm1.orig/fs/hfs/bfind.c
+++ linux-2.6.24-rc6-mm1/fs/hfs/bfind.c
@@ -52,9 +52,9 @@ int __hfs_brec_find(struct hfs_bnode *bn
rec = (e + b) / 2;
len = hfs_brec_lenoff(bnode, rec, &off);
keylen = hfs_brec_keylen(bnode, rec);
- if (keylen == HFS_BAD_KEYLEN) {
+ if (keylen == 0) {
res = -EINVAL;
- goto done;
+ goto fail;
}
hfs_bnode_read(bnode, fd->key, off, keylen);
cmpval = bnode->tree->keycmp(fd->key, fd->search_key);
@@ -71,9 +71,9 @@ int __hfs_brec_find(struct hfs_bnode *bn
if (rec != e && e >= 0) {
len = hfs_brec_lenoff(bnode, e, &off);
keylen = hfs_brec_keylen(bnode, e);
- if (keylen == HFS_BAD_KEYLEN) {
+ if (keylen == 0) {
res = -EINVAL;
- goto done;
+ goto fail;
}
hfs_bnode_read(bnode, fd->key, off, keylen);
}
@@ -83,6 +83,7 @@ done:
fd->keylength = keylen;
fd->entryoffset = off + keylen;
fd->entrylength = len - keylen;
+fail:
return res;
}
@@ -206,7 +207,7 @@ int hfs_brec_goto(struct hfs_find_data *
len = hfs_brec_lenoff(bnode, fd->record, &off);
keylen = hfs_brec_keylen(bnode, fd->record);
- if (keylen == HFS_BAD_KEYLEN) {
+ if (keylen == 0) {
res = -EINVAL;
goto out;
}
Index: linux-2.6.24-rc6-mm1/fs/hfs/brec.c
===================================================================
--- linux-2.6.24-rc6-mm1.orig/fs/hfs/brec.c
+++ linux-2.6.24-rc6-mm1/fs/hfs/brec.c
@@ -49,14 +49,14 @@ u16 hfs_brec_keylen(struct hfs_bnode *no
if (retval > node->tree->max_key_len + 2) {
printk(KERN_ERR "hfs: keylen %d too large\n",
retval);
- retval = HFS_BAD_KEYLEN;
+ retval = 0;
}
} else {
retval = (hfs_bnode_read_u8(node, recoff) | 1) + 1;
if (retval > node->tree->max_key_len + 1) {
printk(KERN_ERR "hfs: keylen %d too large\n",
retval);
- retval = HFS_BAD_KEYLEN;
+ retval = 0;
}
}
}
Index: linux-2.6.24-rc6-mm1/fs/hfs/btree.c
===================================================================
--- linux-2.6.24-rc6-mm1.orig/fs/hfs/btree.c
+++ linux-2.6.24-rc6-mm1/fs/hfs/btree.c
@@ -81,15 +81,23 @@ struct hfs_btree *hfs_btree_open(struct
goto fail_page;
if (!tree->node_count)
goto fail_page;
- if ((id == HFS_EXT_CNID) && (tree->max_key_len != HFS_MAX_EXT_KEYLEN)) {
- printk(KERN_ERR "hfs: invalid extent max_key_len %d\n",
- tree->max_key_len);
- goto fail_page;
- }
- if ((id == HFS_CAT_CNID) && (tree->max_key_len != HFS_MAX_CAT_KEYLEN)) {
- printk(KERN_ERR "hfs: invalid catalog max_key_len %d\n",
- tree->max_key_len);
- goto fail_page;
+ switch(id) {
+ case HFS_EXT_CNID:
+ if (tree->max_key_len != HFS_MAX_EXT_KEYLEN) {
+ printk(KERN_ERR "hfs: invalid extent max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
+ break;
+ case HFS_CAT_CNID:
+ if (tree->max_key_len != HFS_MAX_CAT_KEYLEN) {
+ printk(KERN_ERR "hfs: invalid catalog max_key_len %d\n",
+ tree->max_key_len);
+ goto fail_page;
+ }
+ break;
+ default:
+ BUG();
}
tree->node_size_shift = ffs(size) - 1;
Index: linux-2.6.24-rc6-mm1/fs/hfs/hfs.h
===================================================================
--- linux-2.6.24-rc6-mm1.orig/fs/hfs/hfs.h
+++ linux-2.6.24-rc6-mm1/fs/hfs/hfs.h
@@ -28,8 +28,6 @@
#define HFS_MAX_NAMELEN 128
#define HFS_MAX_VALENCE 32767U
-#define HFS_BAD_KEYLEN 0xFF
-
/* Meanings of the drAtrb field of the MDB,
* Reference: _Inside Macintosh: Files_ p. 2-61
*/
--
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