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migration: check length directly to make sure the range is aligned 

Since the start addr is already checked, to make sure the range is
aligned, checking the length is enough.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190712032704.7826-1-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wei Yang 2019-07-12 11:27:04 +08:00 committed by Paolo Bonzini
parent 5d24821318
commit 72821d93e0
1 changed files with 3 additions and 4 deletions
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7
exec.c
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@ -3901,10 +3901,9 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
if ((start + length) <= rb->used_length) {
bool need_madvise, need_fallocate;
uint8_t *host_endaddr = host_startaddr + length;
if ((uintptr_t)host_endaddr & (rb->page_size - 1)) {
error_report("ram_block_discard_range: Unaligned end address: %p",
host_endaddr);
if (length & (rb->page_size - 1)) {
error_report("ram_block_discard_range: Unaligned length: %zx",
length);
goto err;
}