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From: Prasad J Pandit <pjp@fedoraproject.org>
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Date: Tue, 24 May 2016 13:37:44 +0530
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Subject: [PATCH] scsi: mptsas: infinite loop while fetching requests
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The LSI SAS1068 Host Bus Adapter emulator in Qemu, periodically
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looks for requests and fetches them. A loop doing that in
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mptsas_fetch_requests() could run infinitely if 's->state' was
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not operational. Move check to avoid such a loop.
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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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Cc: qemu-stable@nongnu.org
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Message-Id: <1464077264-25473-1-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 06630554ccbdd25780aa03c3548aaff1eb56dffd)
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---
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hw/scsi/mptsas.c | 9 ++++-----
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1 file changed, 4 insertions(+), 5 deletions(-)
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diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
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index 499c146..be88e16 100644
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--- a/hw/scsi/mptsas.c
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+++ b/hw/scsi/mptsas.c
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@@ -754,11 +754,6 @@ static void mptsas_fetch_request(MPTSASState *s)
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hwaddr addr;
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int size;
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- if (s->state != MPI_IOC_STATE_OPERATIONAL) {
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- mptsas_set_fault(s, MPI_IOCSTATUS_INVALID_STATE);
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- return;
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- }
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-
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/* Read the message header from the guest first. */
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addr = s->host_mfa_high_addr | MPTSAS_FIFO_GET(s, request_post);
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pci_dma_read(pci, addr, req, sizeof(hdr));
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@@ -789,6 +784,10 @@ static void mptsas_fetch_requests(void *opaque)
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{
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MPTSASState *s = opaque;
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+ if (s->state != MPI_IOC_STATE_OPERATIONAL) {
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+ mptsas_set_fault(s, MPI_IOCSTATUS_INVALID_STATE);
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+ return;
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+ }
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while (!MPTSAS_FIFO_EMPTY(s, request_post)) {
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mptsas_fetch_request(s);
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}
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