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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-21 11:05:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-21 11:05:22 -0800
commitf3c233d75ed0dd04e9eaf7cb43d79756fef1ef3a (patch)
tree940fa2fb846a0d6e9bbc3232ebb8295c958d89a7 /kernel
parent10436cf8812edadcc1813dbda39a69e9965caee6 (diff)
parent29183a70b0b828500816bd794b3fe192fce89f73 (diff)
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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull ntp fix from Ingo Molnar: "An adjtimex interface regression fix for 32-bit systems" [ A check that was added in a previous commit is really only a concern for 64bit systems, but was applied to both 32 and 64bit systems, which results in breaking 32bit systems. Thus the fix here is to make the check only apply to 64bit systems ] * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ntp: Fixup adjtimex freq validation on 32-bit systems
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/ntp.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 4b585e0fdd22..0f60b08a4f07 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -633,10 +633,14 @@ int ntp_validate_timex(struct timex *txc)
if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
return -EPERM;
- if (txc->modes & ADJ_FREQUENCY) {
- if (LONG_MIN / PPM_SCALE > txc->freq)
+ /*
+ * Check for potential multiplication overflows that can
+ * only happen on 64-bit systems:
+ */
+ if ((txc->modes & ADJ_FREQUENCY) && (BITS_PER_LONG == 64)) {
+ if (LLONG_MIN / PPM_SCALE > txc->freq)
return -EINVAL;
- if (LONG_MAX / PPM_SCALE < txc->freq)
+ if (LLONG_MAX / PPM_SCALE < txc->freq)
return -EINVAL;
}