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From: Prasad J Pandit <pjp@fedoraproject.org>
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Date: Wed, 14 Sep 2016 15:09:12 +0530
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Subject: [PATCH] scsi: pvscsi: limit process IO loop to ring size
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Vmware Paravirtual SCSI emulator while processing IO requests
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could run into an infinite loop if 'pvscsi_ring_pop_req_descr'
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always returned positive value. Limit IO loop to the ring size.
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Cc: qemu-stable@nongnu.org
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Reported-by: Li Qiang <liqiang6-s@360.cn>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Message-Id: <1473845952-30785-1-git-send-email-ppandit@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit d251157ac1928191af851d199a9ff255d330bec9)
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---
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hw/scsi/vmw_pvscsi.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
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index babac5a..a5ce7de 100644
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--- a/hw/scsi/vmw_pvscsi.c
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+++ b/hw/scsi/vmw_pvscsi.c
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@@ -247,8 +247,11 @@ static hwaddr
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pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
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{
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uint32_t ready_ptr = RS_GET_FIELD(mgr, reqProdIdx);
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+ uint32_t ring_size = PVSCSI_MAX_NUM_PAGES_REQ_RING
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+ * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
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- if (ready_ptr != mgr->consumed_ptr) {
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+ if (ready_ptr != mgr->consumed_ptr
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+ && ready_ptr - mgr->consumed_ptr < ring_size) {
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uint32_t next_ready_ptr =
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mgr->consumed_ptr++ & mgr->txr_len_mask;
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uint32_t next_ready_page =
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