linux-kernel - Re: [tip:timers/core] ntp: Add ADJ

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Date:	Fri, 18 Feb 2011 10:07:25 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	hpa@...or.com, mingo@...hat.com, johnstul@...ibm.com,
	tglx@...utronix.de, richard.cochran@...cron.at
Subject: Re: [tip:timers/core] ntp: Add ADJ_SETOFFSET mode bit


I just noticed a problem with this code. As is, the code will not
detect if the microseconds field (the non-ADJ_NANO case) is out of
range. However, the call to timekeeping_inject_offset() would silently
fail.

This patch corrects the problem by letting timekeeping_inject_offset()
do the check and catching the return code.

Author: Richard Cochran <richard.cochran@...cron.at>
Date:   Fri Feb 18 09:54:19 2011 +0100

    ntp: remove useless and incorrect parameter check
    
    The ADJ_SETOFFSET code redundantly checks the range of the nanoseconds
    field of the time value. This field is checked again in the subsequent
    call to timekeeping_inject_offset(). Also, as is, the check will not
    detect whether the number of microseconds is out of range.
    
    This patch simply lets timekeeping_inject_offset() do the error checking.
    
    Signed-off-by: Richard Cochran <richard.cochran@...cron.at>

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 34d1b64..d62f35a 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -648,13 +648,13 @@ int do_adjtimex(struct timex *txc)
 
 	if (txc->modes & ADJ_SETOFFSET) {
 		struct timespec delta;
-		if ((unsigned long)txc->time.tv_usec >= NSEC_PER_SEC)
-			return -EINVAL;
 		delta.tv_sec  = txc->time.tv_sec;
 		delta.tv_nsec = txc->time.tv_usec;
 		if (!(txc->modes & ADJ_NANO))
 			delta.tv_nsec *= 1000;
-		timekeeping_inject_offset(&delta);
+		result = timekeeping_inject_offset(&delta);
+		if (result)
+			return result;
 	}
 
 	getnstimeofday(&ts);
--
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