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[PATCH] ext3: avoid triggering ext3_error on bad NFS file handle

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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>
This commit is contained in:
Neil Brown 2006-07-30 03:03:01 -07:00 • committed by Linus Torvalds
parent f712c0c7e1
commit 2ccb48ebb4
3 changed files with 29 additions and 8 deletions
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13
fs/ext3/inode.c
View file

@ -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");