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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>
(cherry picked from commit 04bf2526ce)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Prasad J Pandit 2017-07-12 18:08:40 +05:30 committed by Michael Roth
parent f9c313f70f
commit 15d8f91446
1 changed files with 2 additions and 2 deletions
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4
exec.c
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@ -2765,7 +2765,7 @@ static MemTxResult address_space_write_continue(AddressSpace *as, hwaddr addr,
} }
} else { } else {
/* RAM case */ /* 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); memcpy(ptr, buf, l);
invalidate_and_set_dirty(mr, addr1, l); invalidate_and_set_dirty(mr, addr1, l);
} }
@ -2856,7 +2856,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
} }
} else { } else {
/* RAM case */ /* 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); memcpy(buf, ptr, l);
} }