On 2020/7/29 16:11, Jiri Slaby wrote: > But the loop checks for the overflow: > if (vgacon_scrollback_cur->tail >= vgacon_scrollback_cur->size) > vgacon_scrollback_cur->tail = 0; > > So the first 2 iterations would write to the end of the buffer and this > 3rd one should have zeroed ->tail. In the 2nd iteration before the check: vgacon_scrollback_cur->tail is 65360 which is still less then vgacon_scrollback_cur->size(65440), so the ->tail won't be zeroed. Then it gose to the 3rd iteration, overflow occurs. Regards, Yunhai Zhang / NSFOCUS Security Team _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
