Subject: [PATCH AUTOSEL 4.20 036/304] ptp: check gettime64 return code in PTP_SYS_OFFSET ioctl

From: Sasha Levin <[email-masked]>
Date: Mon, 28 Jan 2019 10:39:13 -0500

From: Miroslav Lichvar <[email-masked]>

[ Upstream commit 83d0bdc7390b890905634186baaa294475cd6a06 ]

If a gettime64 call fails, return the error and avoid copying data back
to user.

Cc: Richard Cochran <[email-masked]>
Cc: Jacob Keller <[email-masked]>
Signed-off-by: Miroslav Lichvar <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/ptp/ptp_chardev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 2012551d93e0..796eeffdf93b 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -228,7 +228,9 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 			pct->sec = ts.tv_sec;
 			pct->nsec = ts.tv_nsec;
 			pct++;
-			ptp->info->gettime64(ptp->info, &ts);
+			err = ptp->info->gettime64(ptp->info, &ts);
+			if (err)
+				goto out;
 			pct->sec = ts.tv_sec;
 			pct->nsec = ts.tv_nsec;
 			pct++;
@@ -281,6 +283,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		break;
 	}
 
+out:
 	kfree(sysoff);
 	return err;
 }
-- 
2.19.1