mm: vmalloc allocator off by one

Fix off by one bug in the KVA allocator that can leave gaps in the address
space.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ba6b0f5..46aab4d 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -362,7 +362,7 @@ retry:
                                goto found;
                }
 
-               while (addr + size >= first->va_start && addr + size <= vend) {
+               while (addr + size > first->va_start && addr + size <= vend) {
                        addr = ALIGN(first->va_end + PAGE_SIZE, align);
 
                        n = rb_next(&first->rb_node);