From 8ca56e9e0b878a90bac9860e971b0d849d7a83e7 Mon Sep 17 00:00:00 2001 From: Frans Kaashoek Date: Wed, 1 Sep 2021 07:29:12 -0400 Subject: [PATCH] =?UTF-8?q?memmove(dst,=20src,=200)=20leads=20to=20overflo?= =?UTF-8?q?w=20in=20`while(n--=20>=200)`=20as=20`n`=20is=20uint64=20(thank?= =?UTF-8?q?s=20Mat=C3=BA=C5=A1=20J=C3=B3kay=20)?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- kernel/string.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/string.c b/kernel/string.c index d99e612..153536f 100644 --- a/kernel/string.c +++ b/kernel/string.c @@ -33,6 +33,9 @@ memmove(void *dst, const void *src, uint n) const char *s; char *d; + if(n == 0) + return dst; + s = src; d = dst; if(s < d && s + n > d){