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Fix sintable[] access with out-of-bounds values in core engine functions

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(getzrange, hitscan, clipmove, drawmapview).
They're reproducible with DNE1.3D;  Since these angle values most likely come
from CON code, my suggestion would be to bit-and all values representing angles
with 2047 when setting the from CON, but I'd have to think about potential
side-effects of doing this.

git-svn-id: https://svn.eduke32.com/eduke32@2170 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2011-12-09 19:11:47 +00:00
parent 151287168c
commit 3ca41992dd
1 changed files with 7 additions and 4 deletions
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11
polymer/eduke32/build/src/engine.c
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@ -8690,7 +8690,7 @@ void drawmapview(int32_t dax, int32_t day, int32_t zoome, int16_t ang)
if ((spr->cstat&4) > 0) xoff = -xoff;
if ((spr->cstat&8) > 0) yoff = -yoff;
k = spr->ang;
k = spr->ang&2047; // FIXME ? See DNE_BUG_HERE
cosang = sintable[(k+512)&2047]; sinang = sintable[k];
xspan = tilesizx[tilenum]; xrepeat = spr->xrepeat;
yspan = tilesizy[tilenum]; yrepeat = spr->yrepeat;
@ -11230,7 +11230,7 @@ restart_grand:
if ((cstat&4) > 0) xoff = -xoff;
if ((cstat&8) > 0) yoff = -yoff;
ang = spr->ang;
ang = spr->ang&2047; // FIXME ? See DNE_BUG_HERE
cosang = sintable[(ang+512)&2047]; sinang = sintable[ang];
xspan = tilesizx[tilenum]; xrepeat = spr->xrepeat;
yspan = tilesizy[tilenum]; yrepeat = spr->yrepeat;
@ -12042,7 +12042,7 @@ int32_t clipmove(vec3_t *pos, int16_t *sectnum,
if ((cstat&4) > 0) xoff = -xoff;
if ((cstat&8) > 0) yoff = -yoff;
k = spr->ang;
k = spr->ang&2047; // FIXME ? See DNE_BUG_HERE
cosang = sintable[(k+512)&2047]; sinang = sintable[k];
xspan = tilesizx[tilenum]; xrepeat = spr->xrepeat;
yspan = tilesizy[tilenum]; yrepeat = spr->yrepeat;
@ -12844,7 +12844,10 @@ restart_grand:
if ((cstat&4) > 0) xoff = -xoff;
if ((cstat&8) > 0) yoff = -yoff;
ang = spr->ang;
// &2047: FIXME ? DNE_BUG_HERE
// DNE 1.3D lights camera action (1st level), spr->ang==2306
ang = spr->ang&2047;
cosang = sintable[(ang+512)&2047]; sinang = sintable[ang];
xspan = tilesizx[tilenum]; xrepeat = spr->xrepeat;
yspan = tilesizy[tilenum]; yrepeat = spr->yrepeat;