diff options
| -rw-r--r-- | sys/src/9/port/sysproc.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/src/9/port/sysproc.c b/sys/src/9/port/sysproc.c index 65f83b9bc..8b990806c 100644 --- a/sys/src/9/port/sysproc.c +++ b/sys/src/9/port/sysproc.c @@ -255,6 +255,10 @@ sysexec(va_list list) file0 = va_arg(list, char*); validaddr((uintptr)file0, 1, 0); argp0 = va_arg(list, char**); + evenaddr((uintptr)argp0); + validaddr((uintptr)argp0, 2*BY2WD, 0); + if(*argp0 == nil) + error(Ebadarg); file0 = validnamedup(file0, 1); if(waserror()){ free(file0); @@ -351,9 +355,7 @@ sysexec(va_list list) } } argp = argp0; - evenaddr((uintptr)argp); - validaddr((uintptr)argp, BY2WD, 0); - while(*argp){ + while(*argp != nil){ a = *argp++; if(((uintptr)argp&(BY2PG-1)) < BY2WD) validaddr((uintptr)argp, BY2WD, 0); |