3.16.7-ckt1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Kara <jack@xxxxxxx>
commit 6050d47adcadbb53582434d919ed7f038d936712 upstream.
When ext4_handle_dirty_dx_node() or ext4_handle_dirty_dirent_node()
fail, there's really something wrong with the fs and there's no point in
continuing further. Just return error from make_indexed_dir() in that
case. Also initialize frames array so that if we return early due to
error, dx_release() doesn't try to dereference uninitialized memory
(which could happen also due to error in do_split()).
Coverity-id: 741300
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/ext4/namei.c | 28 ++++++++++++++++++----------
1 file changed, 18 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 50d9225d9e3e..5c0b71c734ea 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1840,31 +1840,39 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
ext4fs_dirhash(name, namelen, &hinfo);
+ memset(frames, 0, sizeof(frames));
frame = frames;
frame->entries = entries;
frame->at = entries;
frame->bh = bh;
bh = bh2;
- ext4_handle_dirty_dx_node(handle, dir, frame->bh);
- ext4_handle_dirty_dirent_node(handle, dir, bh);
+ retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
+ if (retval)
+ goto out_frames;
+ retval = ext4_handle_dirty_dirent_node(handle, dir, bh);
+ if (retval)
+ goto out_frames;
de = do_split(handle,dir, &bh, frame, &hinfo);
if (IS_ERR(de)) {
- /*
- * Even if the block split failed, we have to properly write
- * out all the changes we did so far. Otherwise we can end up
- * with corrupted filesystem.
- */
- ext4_mark_inode_dirty(handle, dir);
- dx_release(frames);
- return PTR_ERR(de);
+ retval = PTR_ERR(de);
+ goto out_frames;
}
dx_release(frames);
retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
brelse(bh);
return retval;
+out_frames:
+ /*
+ * Even if the block split failed, we have to properly write
+ * out all the changes we did so far. Otherwise we can end up
+ * with corrupted filesystem.
+ */
+ ext4_mark_inode_dirty(handle, dir);
+ dx_release(frames);
+ return retval;
}
/*
--
2.1.0
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