[tip:x86/boot] x86/e820: Fix very large 'size' handling boundary condition

[tip-bot for Wei Yang <tipbot@zytor.com>]

Commit-ID:  3ec979658e5cc0fab86a42af79a650299e4d7135
Gitweb:     http://git.kernel.org/tip/3ec979658e5cc0fab86a42af79a650299e4d7135
Author:     Wei Yang <richard.weiyang@gmail.com>
AuthorDate: Sat, 20 Aug 2016 01:40:13 +0000
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 8 Sep 2016 09:11:14 +0200

x86/e820: Fix very large 'size' handling boundary condition

The (start, size) tuple represents a range [start, start + size - 1],
which means "start" and "start + size - 1" should be compared to see
whether the range overflows.

For example, a range with (start, size):

	(0xffffffff fffffff0, 0x00000000 00000010)

represents

	[0xffffffff fffffff0, 0xffffffff ffffffff]

... would be judged overflow in the original code, while actually it is not.

This patch fixes this and makes sure it still works when size is zero.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: yinghai@kernel.org
Link: http://lkml.kernel.org/r/1471657213-31817-1-git-send-email-richard.weiyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/e820.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 621b501..871f186 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -388,11 +388,11 @@ static int __init __append_e820_map(struct e820entry *biosmap, int nr_map)
 	while (nr_map) {
 		u64 start = biosmap->addr;
 		u64 size = biosmap->size;
-		u64 end = start + size;
+		u64 end = start + size - 1;
 		u32 type = biosmap->type;
 
 		/* Overflow in 64 bits? Ignore the memory map. */
-		if (start > end)
+		if (start > end && likely(size))
 			return -1;
 
 		e820_add_region(start, size, type);