44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
From d587bf95f1099fd253e6a7b768bf73d4e25de07c Mon Sep 17 00:00:00 2001
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From: Prasad J Pandit <pjp@fedoraproject.org>
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Date: Wed, 12 Jul 2017 18:08:40 +0530
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Subject: [PATCH 22/23] exec: use qemu_ram_ptr_length to access guest ram
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When accessing guest's ram block during DMA operation, use
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'qemu_ram_ptr_length' to get ram block pointer. It ensures
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that DMA operation of given length is possible; And avoids
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any OOB memory access situations.
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Reported-by: Alex <broscutamaker@gmail.com>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Message-Id: <20170712123840.29328-1-ppandit@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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exec.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/exec.c b/exec.c
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index c97ef4a8da..72d636a4fb 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -2765,7 +2765,7 @@ static MemTxResult address_space_write_continue(AddressSpace *as, hwaddr addr,
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}
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} else {
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/* RAM case */
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- ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
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+ ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
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memcpy(ptr, buf, l);
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invalidate_and_set_dirty(mr, addr1, l);
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}
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@@ -2856,7 +2856,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
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}
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} else {
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/* RAM case */
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- ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
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+ ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
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memcpy(buf, ptr, l);
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}
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--
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2.11.0
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