From cfed84826acdf6aafb35ee0de7acb29f07834898 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 23 Apr 2020 16:40:54 +0200
Subject: cryptfs: add timeout to do_umount

---
 cryptfs.bin.in | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/cryptfs.bin.in b/cryptfs.bin.in
index 4e0effd..d7ba868 100644
--- a/cryptfs.bin.in
+++ b/cryptfs.bin.in
@@ -240,6 +240,7 @@ do_unmount() {
   local inner_fs
   local lazy
   local mount_point
+  local timeout
   if [ "x$1" = 'x-l' ]; then
     lazy='-l'
     shift
@@ -254,12 +255,17 @@ do_unmount() {
     do_unmount -l "${inner_fs}"
   fi
   mount_point=$(mount_details mp "$1")
-  while ! umount ${lazy} "${mount_point}"; do
+  timeout=120
+  while [ ${timeout} -ge 0 ] && ! umount ${lazy} "${mount_point}"; do
     >&2 printf '"umount %s" failed.\n' \
       "${lazy} ${mount_point}"
     fuser -k -M -m "${mount_point}"
     sleep 1
+    timeout=$((timeout-1))
   done
+  if [ ${timeout} -lt 0 ]; then
+    return 1
+  fi
   if [ -n "${inner_fs}" ]; then
     do_mount "${inner_fs}"
   fi
-- 
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