4.20-stable review patch. If anyone has any objections, please let me know.
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[ 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 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; }