diff options
| author | Eric Sandeen <sandeen@redhat.com> | 2007-09-18 22:46:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-09-19 11:24:18 -0700 |
| commit | 3d82abae9523c33d4a16fdfdfd2bdde316d7b56a (patch) | |
| tree | e0059b667ac7ef765814a2ee9587f9e89015b387 /fs/ext4/namei.c | |
| parent | e67aa27a6179c287983c6c525beb5320f5cd1672 (diff) | |
| download | linux-3d82abae9523c33d4a16fdfdfd2bdde316d7b56a.tar.bz2 | |
dir_index: error out instead of BUG on corrupt dx dirs
Convert asserts (BUGs) in dx_probe from bad on-disk data to recoverable
errors with helpful warnings. With help catching other asserts from Duane
Griffin <duaneg@dghda.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Duane Griffin <duaneg@dghda.com>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/namei.c')
| -rw-r--r-- | fs/ext4/namei.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index da224974af78..9468289637a5 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -379,13 +379,28 @@ dx_probe(struct dentry *dentry, struct inode *dir, entries = (struct dx_entry *) (((char *)&root->info) + root->info.info_length); - assert(dx_get_limit(entries) == dx_root_limit(dir, - root->info.info_length)); + + if (dx_get_limit(entries) != dx_root_limit(dir, + root->info.info_length)) { + ext4_warning(dir->i_sb, __FUNCTION__, + "dx entry: limit != root limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail; + } + dxtrace (printk("Look up %x", hash)); while (1) { count = dx_get_count(entries); - assert (count && count <= dx_get_limit(entries)); + if (!count || count > dx_get_limit(entries)) { + ext4_warning(dir->i_sb, __FUNCTION__, + "dx entry: no count or count > limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail2; + } + p = entries + 1; q = entries + count - 1; while (p <= q) @@ -423,8 +438,15 @@ dx_probe(struct dentry *dentry, struct inode *dir, if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err))) goto fail2; at = entries = ((struct dx_node *) bh->b_data)->entries; - assert (dx_get_limit(entries) == dx_node_limit (dir)); + if (dx_get_limit(entries) != dx_node_limit (dir)) { + ext4_warning(dir->i_sb, __FUNCTION__, + "dx entry: limit != node limit"); + brelse(bh); + *err = ERR_BAD_DX_DIR; + goto fail2; + } frame++; + frame->bh = NULL; } fail2: while (frame >= frame_in) { @@ -432,6 +454,10 @@ fail2: frame--; } fail: + if (*err == ERR_BAD_DX_DIR) + ext4_warning(dir->i_sb, __FUNCTION__, + "Corrupt dir inode %ld, running e2fsck is " + "recommended.", dir->i_ino); return NULL; } |