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Date: Mon, 28 Jan 2019 11:22:54 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Miroslav Lichvar <mlichvar@...hat.com>, Richard Cochran <richardcochran@...il.com>, Jacob Keller <jacob.e.keller@...el.com>, "David S . Miller" <davem@...emloft.net>, Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 4.4 13/80] ptp: check gettime64 return code in PTP_SYS_OFFSET ioctl From: Miroslav Lichvar <mlichvar@...hat.com> [ Upstream commit 83d0bdc7390b890905634186baaa294475cd6a06 ] If a gettime64 call fails, return the error and avoid copying data back to user. Cc: Richard Cochran <richardcochran@...il.com> Cc: Jacob Keller <jacob.e.keller@...el.com> Signed-off-by: Miroslav Lichvar <mlichvar@...hat.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 4eb254a273f8..4861cfddcdd3 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -204,7 +204,9 @@ 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++; @@ -257,6 +259,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) break; } +out: kfree(sysoff); return err; } -- 2.19.1
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