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fix Bell of Opening segfault

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Noticed on nethack.alt.org; the Bell of Opening could trigger a
segfault if applied near a trap door or bear trap (and a few others)
that had no monster at the trap location.  Reproducible if done
while mounted; {open,close}{fall,hold}ingtrap() would try to access
monst->mx and monst->my of a Null monst pointer if given one when
u.usteed was non-Null.
This commit is contained in:
PatR
2017-03-17 03:20:11 -07:00
parent dd8a95eec4
commit a03d20d7ab
2 changed files with 9 additions and 1 deletions
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2
doc/fixes36.1
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@@ -368,6 +368,8 @@ add option status_updates to prevent bottom of screen status line updates
fix achievement recording bug with mines and sokoban prizes
g.cubes would eat globs of green slime without harm; engulf those instead
fix up true rumor about rock moles vs boots
Bell of Opening could trigger segfault attempting to open some types of traps
if hero was mounted
Fixes to Post-3.6.0 Problems that Were Exposed Via git Repository

8
src/trap.c
View File

@@ -1,4 +1,4 @@
/* NetHack 3.6 trap.c $NHDT-Date: 1473665044 2016/09/12 07:24:04 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.274 $ */
/* NetHack 3.6 trap.c $NHDT-Date: 1489745987 2017/03/17 10:19:47 $ $NHDT-Branch: NetHack-3.6.0 $:$NHDT-Revision: 1.277 $ */
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* NetHack may be freely redistributed. See license for details. */
@@ -4420,6 +4420,8 @@ boolean *noticed; /* set to true iff hero notices the effect; */
const char *trapdescr, *which;
boolean ishero = (mon == &youmonst);
if (!mon)
return FALSE;
if (mon == u.usteed)
ishero = TRUE;
t = t_at(ishero ? u.ux : mon->mx, ishero ? u.uy : mon->my);
@@ -4478,6 +4480,8 @@ boolean *noticed; /* set to true iff hero notices the effect; */
unsigned dotrapflags;
boolean ishero = (mon == &youmonst), result;
if (!mon)
return FALSE;
if (mon == u.usteed)
ishero = TRUE;
t = t_at(ishero ? u.ux : mon->mx, ishero ? u.uy : mon->my);
@@ -4521,6 +4525,8 @@ boolean *noticed; /* set to true iff hero notices the effect; */
struct trap *t;
boolean ishero = (mon == &youmonst), result;
if (!mon)
return FALSE;
if (mon == u.usteed)
ishero = TRUE;
t = t_at(ishero ? u.ux : mon->mx, ishero ? u.uy : mon->my);