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authorEric Sandeen <sandeen@redhat.com>2008-01-08 15:33:20 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-08 16:10:36 -0800
commitcf0594625083111ae522496dc1c256f7476939c2 (patch)
treef83641f74c89fa4fb17adb2f216b074f2352639c /fs/hfs/brec.c
parent467bc461d2845f6a04b124bca1ae6ecc554e1ee5 (diff)
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hfs: handle more on-disk corruptions without oopsing
hfs seems prone to bad things when it encounters on disk corruption. Many values are read from disk, and used as lengths to memcpy, as an example. This patch fixes up several of these problematic cases. o sanity check the on-disk maximum key lengths on mount (these are set to a defined value at mkfs time and shouldn't differ) o check on-disk node keylens against the maximum key length for each tree o fix hfs_btree_open so that going out via free_tree: doesn't wind up in hfs_releasepage, which wants to follow the very pointer we were trying to set up: HFS_SB(sb)->cat_tree = hfs_btree_open() ... failure gets to hfs_releasepage and tries to follow HFS_SB(sb)->cat_tree Tested with the fsfuzzer; it survives more than it used to. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hfs/brec.c')
-rw-r--r--fs/hfs/brec.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/hfs/brec.c b/fs/hfs/brec.c
index 5c87cf4801fc..8626ee375ea8 100644
--- a/fs/hfs/brec.c
+++ b/fs/hfs/brec.c
@@ -44,10 +44,21 @@ u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
recoff = hfs_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
if (!recoff)
return 0;
- if (node->tree->attributes & HFS_TREE_BIGKEYS)
+ if (node->tree->attributes & HFS_TREE_BIGKEYS) {
retval = hfs_bnode_read_u16(node, recoff) + 2;
- else
+ if (retval > node->tree->max_key_len + 2) {
+ printk(KERN_ERR "hfs: keylen %d too large\n",
+ retval);
+ retval = HFS_BAD_KEYLEN;
+ }
+ } 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;
+ }
+ }
}
return retval;
}