x86/kaslr: Fix off-by-one error in __process_mem_region()

In case of an overlap, the beginning of the region should be used even
if it is exactly image_size, not just strictly larger.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200728225722.67457-6-nivedita@alum.mit.edu

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index da45e66..848346f 100644 (file)
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -669,7 +669,7 @@ static void __process_mem_region(struct mem_vector *entry,
                }
 
                /* Store beginning of region if holds at least image_size. */
-               if (overlap.start > region.start + image_size) {
+               if (overlap.start >= region.start + image_size) {
                        struct mem_vector beginning;
 
                        beginning.start = region.start;