File 0047-scsi-mptsas-infinite-loop-while-fet.patch of Package qemu

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File 0047-scsi-mptsas-infinite-loop-while-fet.patch of Package qemu (Revision 08e7ad1e45a4e551b0bb2b9188ea82ee)

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From 62f461d944c764953299772d72892daca092fe3f Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Tue, 24 May 2016 02:10:00 -0600
Subject: [PATCH] scsi: mptsas: infinite loop while fetching requests

The LSI SAS1068 Host Bus Adapter emulator in Qemu, periodically
looks for requests and fetches them. A loop doing that in
mptsas_fetch_requests() could run infinitely if 's->state' was
not operational. Move check to avoid such a loop.

Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
[BR: CVE-2016-4964 BSC#981399]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/scsi/mptsas.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
index 499c146..be88e16 100644
--- a/hw/scsi/mptsas.c
+++ b/hw/scsi/mptsas.c
@@ -754,11 +754,6 @@ static void mptsas_fetch_request(MPTSASState *s)
     hwaddr addr;
     int size;
 
-    if (s->state != MPI_IOC_STATE_OPERATIONAL) {
-        mptsas_set_fault(s, MPI_IOCSTATUS_INVALID_STATE);
-        return;
-    }
-
     /* Read the message header from the guest first. */
     addr = s->host_mfa_high_addr | MPTSAS_FIFO_GET(s, request_post);
     pci_dma_read(pci, addr, req, sizeof(hdr));
@@ -789,6 +784,10 @@ static void mptsas_fetch_requests(void *opaque)
 {
     MPTSASState *s = opaque;
 
+    if (s->state != MPI_IOC_STATE_OPERATIONAL) {
+        mptsas_set_fault(s, MPI_IOCSTATUS_INVALID_STATE);
+        return;
+    }
     while (!MPTSAS_FIFO_EMPTY(s, request_post)) {
         mptsas_fetch_request(s);
     }

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File 0047-scsi-mptsas-infinite-loop-while-fet.patch of Package qemu (Revision 08e7ad1e45a4e551b0bb2b9188ea82ee)

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