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games/nes: fix buffer overrun

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This commit is contained in:
aiju 2014-03-03 20:13:56 +01:00
parent f7ab9fb52a
commit c92edc1de5
1 changed files with 1 additions and 1 deletions
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2
sys/src/games/nes/ppu.c
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@ -310,7 +310,7 @@ ppustep(void)
mask = mem[PPUMASK];
if((mask & BGDISP) != 0)
drawbg();
if(((mask & BGDISP) == 0 && ppux <= 257 || ppux < 10 && (mask & BG8DISP) == 0) && ppux >= 2)
if((((mask & BGDISP) == 0 && ppux <= 257 || ppux < 10 && (mask & BG8DISP) == 0) && ppux >= 2) && ppuy != 261)
pixel(ppux - 2, ppuy, ppuread(0x3F00), 1);
if((mask & SPRITEDISP) != 0 && ppuy != 261)
drawsprites(ppux >= 10 || (mask & SPRITE8DISP) != 0);