[PATCH 061/270] timekeeping: Cast raw_interval to u64 to avoid shift overflow
From: Herton Ronaldo Krzesinski
Date: Mon Nov 26 2012 - 13:09:57 EST
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3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 5b3900cd409466c0070b234d941650685ad0c791 upstream.
We fixed a bunch of integer overflows in timekeeping code during the 3.6
cycle. I did an audit based on that and found this potential overflow.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: John Stultz <johnstul@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20121009071823.GA19159@xxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
[ herton: adapt for 3.5, timekeeper instead of tk pointer ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
kernel/time/timekeeping.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 63c88c1..8954990 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1012,7 +1012,7 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
}
/* Accumulate raw time */
- raw_nsecs = timekeeper.raw_interval << shift;
+ raw_nsecs = (u64)timekeeper.raw_interval << shift;
raw_nsecs += timekeeper.raw_time.tv_nsec;
if (raw_nsecs >= NSEC_PER_SEC) {
u64 raw_secs = raw_nsecs;
--
1.7.9.5
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- Next message: Herton Ronaldo Krzesinski: "[PATCH 059/270] firewire: cdev: fix user memory corruption (i386 userland on amd64 kernel)"
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