commit 6976c7a69dafbb34a0d4814e2def9d3d7114836d
author Wang Zhaolong <wangzhaolong@huaweicloud.com> Fri Aug 29 08:59:59 2025 +0800
committer Steve French <stfrench@microsoft.com> Sun Aug 31 17:46:57 2025 -0500
tree f75ed457abfa4afd783dfb7f4936aa89b4a7748c
parent b320789d6883cc00ac78ce83bccbfe7ed58afcf0

smb: client: Fix NULL pointer dereference in cifs_debug_dirs_proc_show()

Reading /proc/fs/cifs/open_dirs may hit a NULL dereference when
tcon->cfids is NULL.

Add NULL check before accessing cfids to prevent the crash.

Reproduction:
- Mount CIFS share
- cat /proc/fs/cifs/open_dirs

Fixes: 844e5c0eb176 ("smb3 client: add way to show directory leases for improved debugging")
Signed-off-by: Wang Zhaolong <wangzhaolong@huaweicloud.com>
Signed-off-by: Steve French <stfrench@microsoft.com>