tree 43789fc1348223cbf15ac5ec425d830696c1f89b
parent c1e2f0eaf015fb7076d51a339011f2383e6dd389
author Li Jinyue <lijinyue@huawei.com> 1513242294 +0800
committer Thomas Gleixner <tglx@linutronix.de> 1515952503 +0100

futex: Prevent overflow by strengthen input validation

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
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1513242294-31786-1-git-send-email-lijinyue@huawei.com