s3:libsmb: don't let cli_shutdown() segfault with a NULL cli_state

metze
(similar to commit 47e10ab9a85960c78af807b66b99bcd139713644)
(cherry picked from commit 957c0d4a5ee67ac70e576155a0f2f6f84cdb1596)

Signed-off-by: Stefan Metzmacher <metze@samba.org>

diff --git a/source3/libsmb/clientgen.c b/source3/libsmb/clientgen.c
index 356db57730d9ff1b5b07e6af3e478f1dc5acee78..5dc43e93ad6927808928d47321ac848faa0c98ae 100644 (file)
--- a/source3/libsmb/clientgen.c
+++ b/source3/libsmb/clientgen.c
@@ -599,6 +599,10 @@ void cli_nt_pipes_close(struct cli_state *cli)
 
 void cli_shutdown(struct cli_state *cli)
 {
+       if (cli == NULL) {
+               return;
+       }
+
        if (cli->prev == NULL) {
                /*
                 * Possible head of a DFS list,