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authorNeil Brown <neilb@suse.de>2006-07-30 03:03:01 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-31 13:28:36 -0700
commit2ccb48ebb4de139eef4fcefd5f2bb823cb0d81b9 (patch)
treee06a83c7306e143175a87df2328b45e1ef34da5b /fs/ext3/namei.c
parentf712c0c7e1796f92e45e4de144e247816d974b8f (diff)
[PATCH] ext3: avoid triggering ext3_error on bad NFS file handle
The inode number out of an NFS file handle gets passed eventually to ext3_get_inode_block() without any checking. If ext3_get_inode_block() allows it to trigger an error, then bad filehandles can have unpleasant effect - ext3_error() will usually cause a forced read-only remount, or a panic if `errors=panic' was used. So remove the call to ext3_error there and put a matching check in ext3/namei.c where inode numbers are read off storage. [akpm@osdl.org: fix off-by-one error] Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Jan Kara <jack@suse.cz> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: <stable@kernel.org> Cc: "Stephen C. Tweedie" <sct@redhat.com> Cc: Eric Sandeen <esandeen@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ext3/namei.c')
-rw-r--r--fs/ext3/namei.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index d9176dba3698..2aa7101b27cd 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -1000,7 +1000,12 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str
if (bh) {
unsigned long ino = le32_to_cpu(de->inode);
brelse (bh);
- inode = iget(dir->i_sb, ino);
+ if (!ext3_valid_inum(dir->i_sb, ino)) {
+ ext3_error(dir->i_sb, "ext3_lookup",
+ "bad inode number: %lu", ino);
+ inode = NULL;
+ } else
+ inode = iget(dir->i_sb, ino);
if (!inode)
return ERR_PTR(-EACCES);
@@ -1028,7 +1033,13 @@ struct dentry *ext3_get_parent(struct dentry *child)
return ERR_PTR(-ENOENT);
ino = le32_to_cpu(de->inode);
brelse(bh);
- inode = iget(child->d_inode->i_sb, ino);
+
+ if (!ext3_valid_inum(child->d_inode->i_sb, ino)) {
+ ext3_error(child->d_inode->i_sb, "ext3_get_parent",
+ "bad inode number: %lu", ino);
+ inode = NULL;
+ } else
+ inode = iget(child->d_inode->i_sb, ino);
if (!inode)
return ERR_PTR(-EACCES);