Commit-ID: 6f7d79849a00bba82d3139ff91ff2aaabd12841e
Gitweb: http://git.kernel.org/tip/6f7d79849a00bba82d3139ff91ff2aaabd12841e
Author: Sasha Levin <sasha.levin@xxxxxxxxxx>
AuthorDate: Mon, 1 Dec 2014 23:04:06 -0500
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Fri, 22 May 2015 09:12:22 -0700
time: Make sure tz_minuteswest is set to a valid value when setting time
Invalid values may overflow later, leading to undefined behaviour when
multiplied by 60 to get the amount of seconds.
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
kernel/time/time.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/time/time.c b/kernel/time/time.c
index c42c2c3..972e3bb 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -173,6 +173,10 @@ int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
return error;
if (tz) {
+ /* Verify we're witin the +-15 hrs range */
+ if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
+ return -EINVAL;
+
sys_tz = *tz;
update_vsyscall_tz();
if (firsttime) {
--
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