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Blame 0004-scsi-avoid-an-off-by-one-error-in-megasas_mmio_write.patch

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From: Prasad J Pandit <pjp@fedoraproject.org>
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Date: Mon, 24 Apr 2017 17:36:34 +0530
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Subject: [PATCH] scsi: avoid an off-by-one error in megasas_mmio_write
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While reading magic sequence(MFI_SEQ) in megasas_mmio_write,
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an off-by-one error could occur as 's->adp_reset' index is not
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reset after reading the last sequence.
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Reported-by: YY Z <bigbird475958471@gmail.com>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Message-Id: <20170424120634.12268-1-ppandit@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 24dfa9fa2f90a95ac33c7372de4f4f2c8a2c141f)
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---
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 hw/scsi/megasas.c | 10 +++++-----
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 1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
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index 84b8caf901..804122ab05 100644
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--- a/hw/scsi/megasas.c
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+++ b/hw/scsi/megasas.c
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@@ -2138,15 +2138,15 @@ static void megasas_mmio_write(void *opaque, hwaddr addr,
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     case MFI_SEQ:
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         trace_megasas_mmio_writel("MFI_SEQ", val);
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         /* Magic sequence to start ADP reset */
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-        if (adp_reset_seq[s->adp_reset] == val) {
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-            s->adp_reset++;
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+        if (adp_reset_seq[s->adp_reset++] == val) {
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+            if (s->adp_reset == 6) {
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+                s->adp_reset = 0;
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+                s->diag = MFI_DIAG_WRITE_ENABLE;
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+            }
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         } else {
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             s->adp_reset = 0;
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             s->diag = 0;
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         }
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-        if (s->adp_reset == 6) {
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-            s->diag = MFI_DIAG_WRITE_ENABLE;
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-        }
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         break;
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     case MFI_DIAG:
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         trace_megasas_mmio_writel("MFI_DIAG", val);