kvm: fix kvm_ioctl_create_device() reference counting (CVE-2019-6974)

[uclinux-h8/linux.git] / fs / binfmt_script.c

diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c
index 7cde3f4..d0078cb 100644 (file)
--- a/fs/binfmt_script.c
+++ b/fs/binfmt_script.c
@@ -42,10 +42,14 @@ static int load_script(struct linux_binprm *bprm)
        fput(bprm->file);
        bprm->file = NULL;
 
-       bprm->buf[BINPRM_BUF_SIZE - 1] = '\0';
-       if ((cp = strchr(bprm->buf, '\n')) == NULL)
-               cp = bprm->buf+BINPRM_BUF_SIZE-1;
+       for (cp = bprm->buf+2;; cp++) {
+               if (cp >= bprm->buf + BINPRM_BUF_SIZE)
+                       return -ENOEXEC;
+               if (!*cp || (*cp == '\n'))
+                       break;
+       }
        *cp = '\0';
+
        while (cp > bprm->buf) {
                cp--;
                if ((*cp == ' ') || (*cp == '\t'))