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ACRN:DM: Add pointer check before use the erst 

The event ring segment table  pointer may be NULL when get the address
from guest, add pointer check before use it.

Tracked-On: #6476
Signed-off-by: Liu Long <long.liu@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Liu Long 2021-08-24 16:24:52 +08:00 committed by wenlingz
parent 2cc85f3d63
commit 977da8f084
1 changed files with 5 additions and 0 deletions
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5
devicemodel/hw/pci/xhci.c
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@ -1817,6 +1817,11 @@ pci_xhci_insert_event(struct pci_xhci_vdev *xdev,
int erdp_idx;
rts = &xdev->rtsregs;
if (&rts->erstba_p == NULL) {
UPRINTF(LFTL, "Invalid Event Ring Segment Table base address!\r\n");
return -EINVAL;
}
erdp = rts->intrreg.erdp & ~0xF;
erst = &rts->erstba_p[rts->er_enq_seg];
erdp_idx = (erdp - erst->qwRingSegBase) / sizeof(struct xhci_trb);