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Commit 02a9079c authored by Vlad Tsyrklevich's avatar Vlad Tsyrklevich Committed by David S. Miller
Browse files

drivers/ptp: Fix kernel memory disclosure 



The reserved field precise_offset->rsv is not cleared before being
copied to user space, leaking kernel stack memory. Clear the struct
before it's copied.

Signed-off-by: default avatarVlad Tsyrklevich <vlad@tsyrklevich.net>
Acked-by: default avatarRichard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b8a4ddb2

drivers/ptp/ptp_chardev.c

+1 −0
Original line number Diff line number Diff line
@@ -193,6 +193,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) 
		if (err)

			break;



		memset(&precise_offset, 0, sizeof(precise_offset));

		ts = ktime_to_timespec64(xtstamp.device);

		precise_offset.device.sec = ts.tv_sec;

		precise_offset.device.nsec = ts.tv_nsec;