master 350918e7be: Adjust x_display_set_last_user_time for Xlib sign-extension

[Po Lu]

branch: master
commit 350918e7be82fca046911073b360518173169255
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Adjust x_display_set_last_user_time for Xlib sign-extension
    
    * src/xterm.c (x_display_set_last_user_time): Adjust for Xlib
    sign extending fields in client messages to 64 bit long, which
    then break x_display_set_last_user_time after 24 days, as Time
    is unsigned long for historical reasons.  (bug#59480)
---
 src/xterm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/xterm.c b/src/xterm.c
index 154f404e6b..732fbf462c 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -7749,6 +7749,11 @@ x_display_set_last_user_time (struct x_display_info 
*dpyinfo, Time time,
   old_time = dpyinfo->last_user_time;
 #endif
 
+  /* Time can be sign extended if retrieved from a client message.
+     Make sure it is always 32 bits, or systems with 64-bit longs
+     will crash after 24 days of X server uptime.  (bug#59480) */
+  time &= X_ULONG_MAX;
+
 #ifdef ENABLE_CHECKING
   eassert (time <= X_ULONG_MAX);
 #endif