From: Paulo Alcantara Date: Fri, 6 Dec 2024 14:49:07 +0000 (-0300) Subject: smb: client: fix potential race in cifs_put_tcon() X-Git-Tag: v6.13-rc2~6^2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c32b624fa4f7ca5a2ff217a0b1b2f1352bb4ec11;p=thirdparty%2Fkernel%2Fstable.git smb: client: fix potential race in cifs_put_tcon() dfs_cache_refresh() delayed worker could race with cifs_put_tcon(), so make sure to call list_replace_init() on @tcon->dfs_ses_list after kworker is cancelled or finished. Fixes: 4f42a8b54b5c ("smb: client: fix DFS interlink failover") Signed-off-by: Paulo Alcantara (Red Hat) Signed-off-by: Steve French --- diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 56b3a9eb9b055..2372538a12118 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -2532,9 +2532,6 @@ cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace) list_del_init(&tcon->tcon_list); tcon->status = TID_EXITING; -#ifdef CONFIG_CIFS_DFS_UPCALL - list_replace_init(&tcon->dfs_ses_list, &ses_list); -#endif spin_unlock(&tcon->tc_lock); spin_unlock(&cifs_tcp_ses_lock); @@ -2542,6 +2539,7 @@ cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace) cancel_delayed_work_sync(&tcon->query_interfaces); #ifdef CONFIG_CIFS_DFS_UPCALL cancel_delayed_work_sync(&tcon->dfs_cache_work); + list_replace_init(&tcon->dfs_ses_list, &ses_list); #endif if (tcon->use_witness) {