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[Qemu-devel] [PATCH] exec: use qemu_ram_ptr_length to access guest ram
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P J P |
Subject: |
[Qemu-devel] [PATCH] exec: use qemu_ram_ptr_length to access guest ram |
Date: |
Wed, 12 Jul 2017 18:08:40 +0530 |
From: Prasad J Pandit <address@hidden>
When accessing guest's ram block during DMA operation, use
'qemu_ram_ptr_length' to get ram block pointer. It ensures
that DMA operation of given length is possible; And avoids
any OOB memory access situations.
Reported-by: Alex <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
exec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/exec.c b/exec.c
index a083ff8..ad103ce 100644
--- a/exec.c
+++ b/exec.c
@@ -2929,7 +2929,7 @@ static MemTxResult
address_space_write_continue(AddressSpace *as, hwaddr addr,
}
} else {
/* RAM case */
- ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
+ ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
memcpy(ptr, buf, l);
invalidate_and_set_dirty(mr, addr1, l);
}
@@ -3020,7 +3020,7 @@ MemTxResult address_space_read_continue(AddressSpace *as,
hwaddr addr,
}
} else {
/* RAM case */
- ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
+ ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l);
memcpy(buf, ptr, l);
}
--
2.9.4
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