1 files changed, 9 insertions, 1 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7774c6328970..11a929872ebd 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -323,6 +323,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
         unsigned long addr;
         int purged = 0;
 
+        BUG_ON(!size);
         BUG_ON(size & ~PAGE_MASK);
 
         va = kmalloc_node(sizeof(struct vmap_area),
@@ -334,6 +335,9 @@ retry:
         addr = ALIGN(vstart, align);
 
         spin_lock(&vmap_area_lock);
+        if (addr + size - 1 < addr)
+                goto overflow;
+
         /* XXX: could have a last_hole cache */
         n = vmap_area_root.rb_node;
         if (n) {
@@ -365,6 +369,8 @@ retry:
 
                 while (addr + size > first->va_start && addr + size <= vend) {
                         addr = ALIGN(first->va_end + PAGE_SIZE, align);
+                        if (addr + size - 1 < addr)
+                                goto overflow;
 
                         n = rb_next(&first->rb_node);
                         if (n)
@@ -375,6 +381,7 @@ retry:
         }
 found:
         if (addr + size > vend) {
+overflow:
                 spin_unlock(&vmap_area_lock);
                 if (!purged) {
                         purge_vmap_area_lazy();
@@ -498,6 +505,7 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
         static DEFINE_SPINLOCK(purge_lock);
         LIST_HEAD(valist);
         struct vmap_area *va;
+        struct vmap_area *n_va;
         int nr = 0;
 
         /*
@@ -537,7 +545,7 @@ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end,
 
         if (nr) {
                 spin_lock(&vmap_area_lock);
-                list_for_each_entry(va, &valist, purge_list)
+                list_for_each_entry_safe(va, n_va, &valist, purge_list)
                         __free_vmap_area(va);
                 spin_unlock(&vmap_area_lock);
         }