In the Linux kernel, the following vulnerability has been resolved: drm/xe/oa: Fix overflow in oa batch buffer By default xebbcreatejob() appends a MIBATCHBUFFEREND to batch buffer, this is not a problem if batch buffer is only used once but oa reuses the batch buffer for the same metric and at each call it appends a MIBATCHBUFFEREND, printing the warning below and then overflowing. [ 381.072016] ------------[ cut here ]------------ [ 381.072019] xe 0000:00:02.0: [drm] Assertion bb->len * 4 + bb_prefetch(q->gt) <= size
failed! platform: LUNARLAKE subplatform: 1 graphics: Xe2LPG / Xe2HPG 20.04 step B0 media: Xe2LPM / Xe2HPM 20.00 step B0 tile: 0 VRAM 0 B GT: 0 type 1 So here checking if batch buffer already have MIBATCHBUFFEREND if not append it. v2: - simply fix, suggestion from Ashutosh (cherry picked from commit 9ba0e0f30ca42a98af3689460063edfb6315718a)
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