lkml.org 
[lkml]   [2014]   [Nov]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC 2/2] kvm: eventfd: detect integer overflow using check_*_overflow
Date
Detect integer overflows using safe operations rather than relying on
undefined behaviour.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
virt/kvm/eventfd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 148b239..2eb044f 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -790,7 +790,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
}

/* check for range overflow */
- if (args->addr + args->len < args->addr)
+ if (check_add_overflow(args->len, args->addr))
return -EINVAL;

/* check for extra flags that we don't understand */
--
1.7.10.4


\
 
 \ /
  Last update: 2014-11-26 15:41    [W:1.056 / U:1.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site