1 files changed, 12 insertions, 2 deletions

diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index 04498cbf6002..25028dd4fa18 100644
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -287,11 +287,16 @@ static int pc_clock_adjtime(clockid_t id, struct timex *tx)
         if (err)
                 return err;
 
+        if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
+                err = -EACCES;
+                goto out;
+        }
+
         if (cd.clk->ops.clock_adjtime)
                 err = cd.clk->ops.clock_adjtime(cd.clk, tx);
         else
                 err = -EOPNOTSUPP;
-
+out:
         put_clock_desc(&cd);
 
         return err;
@@ -344,11 +349,16 @@ static int pc_clock_settime(clockid_t id, const struct timespec *ts)
         if (err)
                 return err;
 
+        if ((cd.fp->f_mode & FMODE_WRITE) == 0) {
+                err = -EACCES;
+                goto out;
+        }
+
         if (cd.clk->ops.clock_settime)
                 err = cd.clk->ops.clock_settime(cd.clk, ts);
         else
                 err = -EOPNOTSUPP;
-
+out:
         put_clock_desc(&cd);
 
         return err;