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(S)VGA render: Fix some out of bounds writes.

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This commit is contained in:
OBattler
2025-08-01 07:55:12 +02:00
parent e50bbce21d
commit 5164ce9c82
1 changed files with 9 additions and 3 deletions
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12
src/video/vid_svga_render.c
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@@ -86,9 +86,14 @@ svga_render_blank(svga_t *svga)
}
uint32_t *line_ptr = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][svga->x_add];
uint32_t line_width = (uint32_t) (svga->hdisp + svga->scrollcache) * char_width * sizeof(uint32_t);
int32_t line_width = (uint32_t) (svga->hdisp + svga->scrollcache) * char_width * sizeof(uint32_t);
if ((svga->hdisp + svga->scrollcache) > 0)
if (svga->x_add < 0) {
line_ptr = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][0];
line_width -= svga->x_add;
}
if (((svga->hdisp + svga->scrollcache) > 0) && (line_width >= 0))
memset(line_ptr, 0, line_width);
}
@@ -102,7 +107,8 @@ svga_render_overscan_left(svga_t *svga)
return;
uint32_t *line_ptr = svga->monitor->target_buffer->line[svga->displine + svga->y_add];
for (int i = 0; i < svga->x_add; i++)
if (svga->x_add >= 0) for (int i = 0; i < svga->x_add; i++)
*line_ptr++ = svga->overscan_color;
}