The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 915593a7a663b2ad08b895a5f3ba8b19d89d4ebf Mon Sep 17 00:00:00 2001 From: Tom Rix trix@redhat.com Date: Sat, 26 Mar 2022 12:42:36 -0700 Subject: [PATCH] rtc: check if __rtc_read_time was successful

Clang static analysis reports this issue interface.c:810:8: warning: Passed-by-value struct argument contains uninitialized data now = rtc_tm_to_ktime(tm); ^~~~~~~~~~~~~~~~~~~

tm is set by a successful call to __rtc_read_time() but its return status is not checked. Check if it was successful before setting the enabled flag. Move the decl of err to function scope.

Fixes: 2b2f5ff00f63 ("rtc: interface: ignore expired timers when enqueuing new timers") Signed-off-by: Tom Rix trix@redhat.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Link: https://lore.kernel.org/r/20220326194236.2916310-1-trix@redhat.com

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index d8e835798153..9edd662c69ac 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -804,9 +804,13 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue); struct rtc_time tm; ktime_t now; + int err; + + err = __rtc_read_time(rtc, &tm); + if (err) + return err;

timer->enabled = 1; - __rtc_read_time(rtc, &tm); now = rtc_tm_to_ktime(tm);

/* Skip over expired timers */ @@ -820,7 +824,6 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) trace_rtc_timer_enqueue(timer); if (!next || ktime_before(timer->node.expires, next->expires)) { struct rtc_wkalrm alarm; - int err;

alarm.time = rtc_ktime_to_tm(timer->node.expires); alarm.enabled = 1;