[PATCH AUTOSEL 4.4 13/80] ptp: check gettime64 return code in PTP_SYS_OFFSET ioctl
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From: Sasha Levin <sashal@kernel.org>
Date: 2019-01-28 16:24:32
Also in:
lkml, stable
Subsystem:
networking drivers, ptp hardware clock support, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Linus Torvalds
From: Miroslav Lichvar <mlichvar@redhat.com> [ Upstream commit 83d0bdc7390b890905634186baaa294475cd6a06 ] If a gettime64 call fails, return the error and avoid copying data back to user. Cc: Richard Cochran <richardcochran@gmail.com> Cc: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.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