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i386: amd_iommu: fix MMIO register count and access

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IOMMU MMIO registers are divided in two groups by their offsets.
Low offsets(<0x2000) registers are grouped into 'amdvi_mmio_low'
table and higher offsets(>=0x2000) registers are grouped into
'amdvi_mmio_high' table. No of registers in each table is given
by macro 'AMDVI_MMIO_REGS_LOW' and 'AMDVI_MMIO_REGS_HIGH' resp.
Values of these two macros were swapped, resulting in an OOB
access when reading 'amdvi_mmio_high' table. Correct these two
macros. Also read from 'amdvi_mmio_low' table for lower address.

Reported-by: Azureyang <azureyang@tencent.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Prasad J Pandit 2016-12-02 16:46:26 +05:30 • committed by Michael S. Tsirkin
parent e10e798c85
commit d9429b84af
2 changed files with 3 additions and 3 deletions
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2
hw/i386/amd_iommu.c
View file

@ -562,7 +562,7 @@ static void amdvi_mmio_trace(hwaddr addr, unsigned size)
trace_amdvi_mmio_read(amdvi_mmio_high[index], addr, size, addr & ~0x07);
} else {
index = index >= AMDVI_MMIO_REGS_LOW ? AMDVI_MMIO_REGS_LOW : index;
trace_amdvi_mmio_read(amdvi_mmio_high[index], addr, size, addr & ~0x07);
trace_amdvi_mmio_read(amdvi_mmio_low[index], addr, size, addr & ~0x07);
}
}