exec: use qemu_ram_ptr_length to access guest ram
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 <broscutamaker@gmail.com> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Message-Id: <20170712123840.29328-1-ppandit@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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04bf2526ce
4
exec.c
4
exec.c
@ -2929,7 +2929,7 @@ 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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@ -3020,7 +3020,7 @@ 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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