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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 /include
parentf712c0c7e1796f92e45e4de144e247816d974b8f (diff)
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[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 'include')
-rw-r--r--include/linux/ext3_fs.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 5607e64..9f9cce7 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -492,6 +492,15 @@ static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
{
return container_of(inode, struct ext3_inode_info, vfs_inode);
}
+
+static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
+{
+ return ino == EXT3_ROOT_INO ||
+ ino == EXT3_JOURNAL_INO ||
+ ino == EXT3_RESIZE_INO ||
+ (ino >= EXT3_FIRST_INO(sb) &&
+ ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
+}
#else
/* Assume that user mode programs are passing in an ext3fs superblock, not
* a kernel struct super_block. This will allow us to call the feature-test
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