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cc_draw: avoid integer overflow

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This commit is contained in:
Jacek Jendrzej
2019-10-13 16:47:37 +02:00
parent 907c5b52ce
commit 980dee5622
1 changed files with 16 additions and 17 deletions
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33
src/gui/components/cc_draw.cpp
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@@ -424,31 +424,30 @@ void CCDraw::clearFbData()
bool CCDraw::CheckFbData(const cc_fbdata_t& fbdata, const char* func, const int line)
{
if (fbdata.x < 0 || fbdata.y < 0 || fbdata.dx == 0 || fbdata.dy == 0) {
dprintf(DEBUG_DEBUG,"[CCDraw]\t[%s - %d], INFO! Position < 0 or dx and/or dy = 0, x = %d, y = %d, dx = %d, dy = %d item: %s [type: %d]\n",
func, line,
fbdata.x, fbdata.y,
fbdata.dx, fbdata.dy,
cc_item_type.name.c_str(),
cc_item_type.id
);
return false;
}
int32_t rows = fbdata.dx / (int32_t)frameBuffer->getScreenWidth(true) - 1 + fbdata.y;
int32_t rest = fbdata.dx % (int32_t)frameBuffer->getScreenWidth(true);
int32_t end = rows * (int32_t)frameBuffer->getScreenWidth(true) + rest;
if ( (fbdata.x < 0 || fbdata.y < 0) ||
(end >= (int32_t)frameBuffer->getScreenWidth(true)*(int32_t)frameBuffer->getScreenHeight(true))
) {
dprintf(DEBUG_NORMAL, "[CCDraw] ERROR! Position < 0 or > FB end [%s - %d]\n\tx = %d y = %d\n\tdx = %d dy = %d\n item: %s [type: %d]\n",
int32_t end = rows * (int32_t)frameBuffer->getScreenWidth(true) + rest;
if (end >= (int32_t)frameBuffer->getScreenWidth(true)*(int32_t)frameBuffer->getScreenHeight(true))
{
dprintf(DEBUG_NORMAL, "[CCDraw] ERROR! Position > FB end [%s - %d]\n\tx = %d y = %d\n\tdx = %d dy = %d\n item: %s [type: %d]\n",
func, line,
fbdata.x, fbdata.y,
fbdata.dx, fbdata.dy,
cc_item_type.name.c_str(),
cc_item_type.id
);
return false;
}
if (fbdata.dx == 0 || fbdata.dy == 0) {
dprintf(DEBUG_DEBUG,"[CCDraw]\t[%s - %d], INFO! dx and/or dy = 0, tx = %d, y = %d, dx = %d, dy = %d item: %s [type: %d]\n",
func, line,
fbdata.x, fbdata.y,
fbdata.dx, fbdata.dy,
cc_item_type.name.c_str(),
cc_item_type.id
);
return false;
}
return false;
}
return true;
}