From: Chunfeng Yun chunfeng.yun@mediatek.com
commit de5107f473190538a65aac7edea85209cd5c1a8f upstream.
Bus bandwidth array access is based on esit, increase one will cause out-of-bounds issue; for example, when esit is XHCI_MTK_MAX_ESIT, will overstep boundary.
Fixes: 7c986fbc16ae ("usb: xhci-mtk: get the microframe boundary for ESIT") Cc: stable@vger.kernel.org Reported-by: Stan Lu stan.lu@mediatek.com Signed-off-by: Chunfeng Yun chunfeng.yun@mediatek.com Link: https://lore.kernel.org/r/1629189389-18779-5-git-send-email-chunfeng.yun@med... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-mtk-sch.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/usb/host/xhci-mtk-sch.c +++ b/drivers/usb/host/xhci-mtk-sch.c @@ -539,10 +539,12 @@ static u32 get_esit_boundary(struct mu3h u32 boundary = sch_ep->esit;
if (sch_ep->sch_tt) { /* LS/FS with TT */ - /* tune for CS */ - if (sch_ep->ep_type != ISOC_OUT_EP) - boundary++; - else if (boundary > 1) /* normally esit >= 8 for FS/LS */ + /* + * tune for CS, normally esit >= 8 for FS/LS, + * not add one for other types to avoid access array + * out of boundary + */ + if (sch_ep->ep_type == ISOC_OUT_EP && boundary > 1) boundary--; }