From a2c183d885e6a4946b5fb1f0773d38e404b47baf Mon Sep 17 00:00:00 2001 From: Jinjie Ruan Date: Fri, 18 Oct 2024 18:07:48 +0800 Subject: [PATCH] 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 Signed-off-by: Jinjie Ruan Acked-by: Anna-Maria Behnsen [pabeni@redhat.com: fixed commit message typo] Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- kernel/time/posix-clock.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/time/posix-clock.c b/kernel/time/posix-clock.c index 8127673bf..05e73d209 100755 --- a/kernel/time/posix-clock.c +++ b/kernel/time/posix-clock.c @@ -290,6 +290,9 @@ 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; @@ -299,9 +302,6 @@ 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