diff options
| -rw-r--r-- | arch/x86/xen/p2m.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 996ee2bf7bdb..c3e92912c3fb 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -396,6 +396,7 @@ unsigned long __init xen_revector_p2m_tree(void) unsigned long va_start; unsigned long va_end; unsigned long pfn; + unsigned long pfn_free = 0; unsigned long *mfn_list = NULL; unsigned long size; @@ -442,11 +443,18 @@ unsigned long __init xen_revector_p2m_tree(void) if (mid_p >= (unsigned long *)va_start && mid_p <= (unsigned long *)va_end) { unsigned long *new; - new = &mfn_list[pfn]; + if (pfn_free > (size / sizeof(unsigned long))) { + WARN(1, "Only allocated for %ld pages, but we want %ld!\n", + size / sizeof(unsigned long), pfn_free); + return 0; + } + new = &mfn_list[pfn_free]; copy_page(new, mid_p); - p2m_top[topidx][mididx] = &mfn_list[pfn]; - p2m_top_mfn_p[topidx][mididx] = virt_to_mfn(&mfn_list[pfn]); + p2m_top[topidx][mididx] = &mfn_list[pfn_free]; + p2m_top_mfn_p[topidx][mididx] = virt_to_mfn(&mfn_list[pfn_free]); + + pfn_free += P2M_PER_PAGE; } /* This should be the leafs allocated for identity from _brk. */ |