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authorJohn Stultz <john.stultz@linaro.org>2012-09-11 15:04:19 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-02 10:30:36 -0700
commit9a227fcb842a03fce5b8a6da0da40f5601ec6908 (patch)
treed186f0f90e021d9fc9a35ab009cdcab3e315c8a2 /include
parent80257cbe62ea0919153c43421746269ab68473bf (diff)
time: Move ktime_t overflow checking into timespec_valid_strict
commit cee58483cf56e0ba355fdd97ff5e8925329aa936 upstream Andreas Bombe reported that the added ktime_t overflow checking added to timespec_valid in commit 4e8b14526ca7 ("time: Improve sanity checking of timekeeping inputs") was causing problems with X.org because it caused timeouts larger then KTIME_T to be invalid. Previously, these large timeouts would be clamped to KTIME_MAX and would never expire, which is valid. This patch splits the ktime_t overflow checking into a new timespec_valid_strict function, and converts the timekeeping codes internal checking to use this more strict function. Reported-and-tested-by: Andreas Bombe <aeb@debian.org> Cc: Zhouping Liu <zliu@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/time.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
index ac3118640e5c..03dce74e217c 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -125,6 +125,13 @@ static inline bool timespec_valid(const struct timespec *ts)
/* Can't have more nanoseconds then a second */
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return false;
+ return true;
+}
+
+static inline bool timespec_valid_strict(const struct timespec *ts)
+{
+ if (!timespec_valid(ts))
+ return false;
/* Disallow values that could overflow ktime_t */
if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
return false;