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cifs: Only free DFS target list if we actually got one

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Fix potential NULL ptr deref when DFS target list is empty.

Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2018-11-20 14:37:18 -02:00 committed by Steve French
parent e511d31753
commit 2332440714
1 changed files with 3 additions and 3 deletions
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6
fs/cifs/connect.c
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@ -452,8 +452,8 @@ cifs_reconnect(struct TCP_Server_Info *server)
struct mid_q_entry *mid_entry;
struct list_head retry_list;
#ifdef CONFIG_CIFS_DFS_UPCALL
struct cifs_sb_info *cifs_sb;
struct dfs_cache_tgt_list tgt_list;
struct cifs_sb_info *cifs_sb = NULL;
struct dfs_cache_tgt_list tgt_list = {0};
struct dfs_cache_tgt_iterator *tgt_it = NULL;
#endif
@ -592,8 +592,8 @@ cifs_reconnect(struct TCP_Server_Info *server)
cifs_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n",
__func__, rc);
}
dfs_cache_free_tgts(&tgt_list);
}
dfs_cache_free_tgts(&tgt_list);
#endif
if (server->tcpStatus == CifsNeedNegotiate)
mod_delayed_work(cifsiod_wq, &server->echo, 0);