[v3,6/9] btrfs: Check name_len before read in iterate_dir_item
diff mbox

Message ID 20170606095708.494-7-suy.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Su Yue June 6, 2017, 9:57 a.m. UTC
Since 'iterate_dir_item' checks name_len in its way,
so use 'btrfs_is_name_len_valid' not 'verify_dir_item' to make more strict
name_len check.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 fs/btrfs/send.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

David Sterba June 6, 2017, 1:12 p.m. UTC | #1
On Tue, Jun 06, 2017 at 05:57:05PM +0800, Su Yue wrote:
> Since 'iterate_dir_item' checks name_len in its way,
> so use 'btrfs_is_name_len_valid' not 'verify_dir_item' to make more strict
> name_len check.
> 
> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> ---
>  fs/btrfs/send.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
> index fc496a6f842a..f0e33f7f221e 100644
> --- a/fs/btrfs/send.c
> +++ b/fs/btrfs/send.c
> @@ -1069,6 +1069,12 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path,
>  			}
>  		}
>  
> +		ret = btrfs_is_name_len_valid(eb, path->slots[0],
> +			  (unsigned long)(di + 1), name_len + data_len);
> +		if (!ret) {
> +			ret = -ENAMETOOLONG;

Nikolai pointed out in previous patch iteration that this should be EIO,
I'm fixing it at commit time.
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Patch
diff mbox

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index fc496a6f842a..f0e33f7f221e 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1069,6 +1069,12 @@  static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path,
 			}
 		}
 
+		ret = btrfs_is_name_len_valid(eb, path->slots[0],
+			  (unsigned long)(di + 1), name_len + data_len);
+		if (!ret) {
+			ret = -ENAMETOOLONG;
+			goto out;
+		}
 		if (name_len + data_len > buf_len) {
 			buf_len = name_len + data_len;
 			if (is_vmalloc_addr(buf)) {