fix out of bounds write for zero length buffer in gethostname

diff --git a/src/unistd/gethostname.c b/src/unistd/gethostname.c
index f984b7d..633ef57 100644 (file)
--- a/src/unistd/gethostname.c
+++ b/src/unistd/gethostname.c
@@ -8,6 +8,6 @@ int gethostname(char *name, size_t len)
        if (uname(&uts)) return -1;
        if (len > sizeof uts.nodename) len = sizeof uts.nodename;
        for (i=0; i<len && (name[i] = uts.nodename[i]); i++);
-       if (i==len) name[i-1] = 0;
+       if (i && i==len) name[i-1] = 0;
        return 0;
 }