Subj : src/sbbs3/userdat.c
To   : Git commit to main/sbbs/master
From : Rob Swindell
Date : Mon Apr 25 2022 02:21 pm

https://gitlab.synchro.net/main/sbbs/-/commit/14940b8a7f261cb137b69035
Modified Files:
	src/sbbs3/userdat.c
Log Message:
Fix possible underflow conditions in gettimeleft()

If a non-'T' exempt user had already used more time today than their security level allows, their timeleft would be computed as a negative value due to integer underflow. Since the return value of this function is assigned to a ulong (timeleft), this becomes a large positive number. Cap the floor of the computed time left at 0.

Also fix the potential for underflow that could occur if the system clock changes while a user is online and 'now' becomes greater than 'starttime'.

.