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From: Prasad J Pandit <pjp@fedoraproject.org>
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Date: Wed, 25 May 2016 17:55:10 +0530
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Subject: [PATCH] scsi: megasas: check 'read_queue_head' index value
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While doing MegaRAID SAS controller command frame lookup, routine
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'megasas_lookup_frame' uses 'read_queue_head' value as an index
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into 'frames[MEGASAS_MAX_FRAMES=2048]' array. Limit its value
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within array bounds to avoid any OOB access.
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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: <1464179110-18593-1-git-send-email-ppandit@redhat.com>
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Reviewed-by: Alexander Graf <agraf@suse.de>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit b60bdd1f1ee1616b7a9aeeffb4088e1ce2710fb2)
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---
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hw/scsi/megasas.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
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index bf642d4..cc66d36 100644
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--- a/hw/scsi/megasas.c
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+++ b/hw/scsi/megasas.c
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@@ -650,7 +650,9 @@ static int megasas_init_firmware(MegasasState *s, MegasasCmd *cmd)
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pa_hi = le32_to_cpu(initq->pi_addr_hi);
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s->producer_pa = ((uint64_t) pa_hi << 32) | pa_lo;
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s->reply_queue_head = ldl_le_pci_dma(pcid, s->producer_pa);
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+ s->reply_queue_head %= MEGASAS_MAX_FRAMES;
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s->reply_queue_tail = ldl_le_pci_dma(pcid, s->consumer_pa);
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+ s->reply_queue_tail %= MEGASAS_MAX_FRAMES;
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flags = le32_to_cpu(initq->flags);
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if (flags & MFI_QUEUE_FLAG_CONTEXT64) {
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s->flags |= MEGASAS_MASK_USE_QUEUE64;
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