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btrfs: Verify dir_item in replay_xattr_deletes

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replay_xattr_deletes calls btrfs_search_slot to get buffer and reads
name.

Call verify_dir_item to check name_len in replay_xattr_deletes to avoid
reading out of boundary.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2017-06-06 17:57:03 +08:00 committed by David Sterba
parent 26a836cec2
commit 8ee8c2d62d
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/tree-log.c
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@ -2111,6 +2111,7 @@ static int replay_xattr_deletes(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
const u64 ino)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_key search_key;
struct btrfs_path *log_path;
int i;
@ -2152,6 +2153,12 @@ process_leaf:
u32 this_len = sizeof(*di) + name_len + data_len;
char *name;
ret = verify_dir_item(fs_info, path->nodes[0],
path->slots[0], di);
if (ret) {
ret = -EIO;
goto out;
}
name = kmalloc(name_len, GFP_NOFS);
if (!name) {
ret = -ENOMEM;