fix memory region validation in argptr()

2015-12-19 22:52:11 +09:00 · 2015-12-19 22:52:11 +09:00 · 2a675089b1
parent 0df5f11bae
commit 2a675089b1
1 changed files with 1 additions and 1 deletions
--- a/syscall.c
+++ b/syscall.c
@ -58,7 +58,7 @@ argptr(int n, char **pp, int size)

  if(argint(n, &i) < 0)
    return -1;
-  if((uint)i >= proc->sz || (uint)i+size > proc->sz)
+  if(size < 0 || (uint)i >= proc->sz || (uint)i+size > proc->sz)
    return -1;
  *pp = (char*)i;
  return 0;