posix-clock: posix-clock: Fix unbalanced locking in pc_clock_settime()

[ Upstream commit 6e62807c7fbb3c758d233018caf94dfea9c65dbd ]

If get_clock_desc() succeeds, it calls fget() for the clockid's fd,
and get the clk->rwsem read lock, so the error path should release
the lock to make the lock balance and fput the clockid's fd to make
the refcount balance and release the fd related resource.

However the below commit left the error path locked behind resulting in
unbalanced locking. Check timespec64_valid_strict() before
get_clock_desc() to fix it, because the "ts" is not changed
after that.

Fixes: d8794ac20a29 ("posix-clock: Fix missing timespec64 check in pc_clock_settime()")
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Acked-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
[pabeni@redhat.com: fixed commit message typo]
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c
index 6b5d5c0021fae6ed8074a627a3fb9fffee132cc0..a6487a9d608533052876d77df246e478e8c7955b 100644 (file)
--- a/kernel/time/posix-clock.c
+++ b/kernel/time/posix-clock.c
@@ -310,6 +310,9 @@ static int pc_clock_settime(clockid_t id, const struct timespec64 *ts)
        struct posix_clock_desc cd;
        int err;
 
+       if (!timespec64_valid_strict(ts))
+               return -EINVAL;
+
        err = get_clock_desc(id, &cd);
        if (err)
                return err;
@@ -319,9 +322,6 @@ static int pc_clock_settime(clockid_t id, const struct timespec64 *ts)
                goto out;
        }
 
-       if (!timespec64_valid_strict(ts))
-               return -EINVAL;
-
        if (cd.clk->ops.clock_settime)
                err = cd.clk->ops.clock_settime(cd.clk, ts);
        else