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futex: Prevent overflow by strengthen input validation 

commit fbe0e839d1e22d88810f3ee3e2f1479be4c0aa4a upstream.

UBSAN reports signed integer overflow in kernel/futex.c:

 UBSAN: Undefined behaviour in kernel/futex.c:2041:18
 signed integer overflow:
 0 - -2147483648 cannot be represented in type 'int'

Add a sanity check to catch negative values of nr_wake and nr_requeue.

Signed-off-by: Li Jinyue <lijinyue@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: peterz@infradead.org
Cc: dvhart@infradead.org
Link: https://lkml.kernel.org/r/1513242294-31786-1-git-send-email-lijinyue@huawei.com
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Li Jinyue 2017-12-14 17:04:54 +08:00 committed by syphyr
parent 0ec4601324
commit 1531fc28e0
1 changed files with 3 additions and 0 deletions
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kernel/futex.c
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@ -1375,6 +1375,9 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
struct plist_head *head1;
struct futex_q *this, *next;
if (nr_wake < 0 || nr_requeue < 0)
return -EINVAL;
if (requeue_pi) {
/*
* Requeue PI only works on two distinct uaddrs. This