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extmod/modframebuf: Fix crash in FrameBuffer scrolling beyond extents. 

Fixed the crash occurring when scrolling by at least the size of the
framebuffer.
This commit is contained in:
TPReal 2022-11-26 13:25:08 +01:00 committed by Damien George
parent 002f54ab4e
commit bf49a087b2
1 changed files with 12 additions and 0 deletions
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12
extmod/modframebuf.c
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@ -748,19 +748,31 @@ STATIC mp_obj_t framebuf_scroll(mp_obj_t self_in, mp_obj_t xstep_in, mp_obj_t ys
if (xstep < 0) {
sx = 0;
xend = self->width + xstep;
if (xend <= 0) {
return mp_const_none;
}
dx = 1;
} else {
sx = self->width - 1;
xend = xstep - 1;
if (xend >= sx) {
return mp_const_none;
}
dx = -1;
}
if (ystep < 0) {
y = 0;
yend = self->height + ystep;
if (yend <= 0) {
return mp_const_none;
}
dy = 1;
} else {
y = self->height - 1;
yend = ystep - 1;
if (yend >= y) {
return mp_const_none;
}
dy = -1;
}
for (; y != yend; y += dy) {