[v3,7/9] btrfs: Check name_len before read in btrfs_get_name
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Message ID 20170606095708.494-8-suy.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Su Yue June 6, 2017, 9:57 a.m. UTC
In 'btrfs_get_name', it does 'btrfs_search_slot' and reads name from
inode_ref/root_ref.

Call btrfs_is_name_len_valid in btrfs_get_name.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 fs/btrfs/export.c | 5 +++++
 1 file changed, 5 insertions(+)

Patch
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diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 87144c9f9593..fa66980726c9 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -282,6 +282,11 @@  static int btrfs_get_name(struct dentry *parent, char *name,
 		name_len = btrfs_inode_ref_name_len(leaf, iref);
 	}
 
+	ret = btrfs_is_name_len_valid(leaf, path->slots[0], name_ptr, name_len);
+	if (!ret) {
+		btrfs_free_path(path);
+		return -EIO;
+	}
 	read_extent_buffer(leaf, name, name_ptr, name_len);
 	btrfs_free_path(path);