diff options
author | Prasad J Pandit <pjp@fedoraproject.org> | 2017-07-12 18:08:40 +0530 |
---|---|---|
committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2017-09-01 18:10:46 -0500 |
commit | 15d8f91446fe922ccabb20b7e4ab4b32d8f7b5a7 (patch) | |
tree | 9c5775d7e2804aed9d78d4d02554daed45dab1a7 | |
parent | f9c313f70f3c269e301a04c6ba1dd9a813589d7a (diff) | |
download | qemu-15d8f91446fe922ccabb20b7e4ab4b32d8f7b5a7.tar.gz |
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 04bf2526ce87f21b32c9acba1c5518708c243ad0)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
-rw-r--r-- | exec.c | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -2765,7 +2765,7 @@ 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); } @@ -2856,7 +2856,7 @@ 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); } |