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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/inode.c
parentf712c0c7e1796f92e45e4de144e247816d974b8f (diff)
downloadlinux-2ccb48ebb4de139eef4fcefd5f2bb823cb0d81b9.tar.bz2
[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/inode.c')
-rw-r--r--fs/ext3/inode.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index f804d5e9d60c..ab034d3053ea 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -2402,14 +2402,15 @@ static ext3_fsblk_t ext3_get_inode_block(struct super_block *sb,
struct buffer_head *bh;
struct ext3_group_desc * gdp;
-
- if ((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)) {
- ext3_error(sb, "ext3_get_inode_block",
- "bad inode number: %lu", ino);
+ if (!ext3_valid_inum(sb, ino)) {
+ /*
+ * This error is already checked for in namei.c unless we are
+ * looking at an NFS filehandle, in which case no error
+ * report is needed
+ */
return 0;
}
+
block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
if (block_group >= EXT3_SB(sb)->s_groups_count) {
ext3_error(sb,"ext3_get_inode_block","group >= groups count");