futex: Prevent overflow by strengthen input validation
commit fbe0e839d1
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
parent
bb7119eea2
commit
d8a3170db0
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@ -1711,6 +1711,9 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
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struct futex_q *this, *next;
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WAKE_Q(wake_q);
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if (nr_wake < 0 || nr_requeue < 0)
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return -EINVAL;
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if (requeue_pi) {
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/*
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* Requeue PI only works on two distinct uaddrs. This
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