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usb: xhci-mtk: fix issue of out-of-bounds array access

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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: 7c986fbc16 ("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@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-08-17 16:36:25 +08:00 committed by Greg Kroah-Hartman
parent 7465d7b66a
commit de5107f473
1 changed files with 6 additions and 4 deletions
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10
drivers/usb/host/xhci-mtk-sch.c
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@ -575,10 +575,12 @@ static u32 get_esit_boundary(struct mu3h_sch_ep_info *sch_ep)
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--;
}