futex: Prevent overflow by strengthen input validation

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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>

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Li Jinyue 2017-12-14 17:04:54 +08:00 • committed by Greg Kroah-Hartman

parent 1352130fe6

commit 17ae6ccfe5

1 changed files with 3 additions and 0 deletions

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kernel/futex.c

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