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am,nemu-devices,video: assertion fails when out of bound

This commit is contained in:
Zihao Yu 2019-05-01 18:03:29 +08:00
parent 86476dc148
commit 9d103b1de3
1 changed files with 4 additions and 3 deletions
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7
am/src/nemu-devices/nemu-video.c
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@ -24,13 +24,14 @@ size_t video_write(uintptr_t reg, void *buf, size_t size) {
_DEV_VIDEO_FBCTL_t *ctl = (_DEV_VIDEO_FBCTL_t *)buf;
int x = ctl->x, y = ctl->y, w = ctl->w, h = ctl->h;
uint32_t *pixels = ctl->pixels;
int len = sizeof(uint32_t) * ( (x + w >= W) ? W - x : w );
assert(x + w <= W && y + h <= H);
//int len = sizeof(uint32_t) * ( (x + w >= W) ? W - x : w );
int len = sizeof(uint32_t) * w;
uint32_t *p_fb = &fb[y * W + x];
int j;
for (j = 0; j < h; j ++) {
if (y + j < H) { memcpy(p_fb, pixels, len); }
else { break; }
memcpy(p_fb, pixels, len);
p_fb += W;
pixels += w;
}