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futex: Fix futex_waitv() hrtimer debug object leak on kcalloc error

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commit 94cd8fa09f5f1ebdd4e90964b08b7f2cc4b36c43 upstream.

In a scenario where kcalloc() fails to allocate memory, the futex_waitv
system call immediately returns -ENOMEM without invoking
destroy_hrtimer_on_stack(). When CONFIG_DEBUG_OBJECTS_TIMERS=y, this
results in leaking a timer debug object.

Fixes: bf69bad38cf6 ("futex: Implement sys_futex_waitv()")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: stable@vger.kernel.org
Cc: stable@vger.kernel.org # v5.16+
Link: https://lore.kernel.org/r/20221214222008.200393-1-mathieu.desnoyers@efficios.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Desnoyers 2022-12-14 17:20:08 -05:00 committed by Greg Kroah-Hartman
parent c86c5cf67f
commit 09727bc32f
1 changed files with 7 additions and 4 deletions

11
kernel/futex/syscalls.c

@ -286,19 +286,22 @@ SYSCALL_DEFINE5(futex_waitv, struct futex_waitv __user *, waiters,
} }
futexv = kcalloc(nr_futexes, sizeof(*futexv), GFP_KERNEL); futexv = kcalloc(nr_futexes, sizeof(*futexv), GFP_KERNEL);
if (!futexv) if (!futexv) {
return -ENOMEM; ret = -ENOMEM;
goto destroy_timer;
}
ret = futex_parse_waitv(futexv, waiters, nr_futexes); ret = futex_parse_waitv(futexv, waiters, nr_futexes);
if (!ret) if (!ret)
ret = futex_wait_multiple(futexv, nr_futexes, timeout ? &to : NULL); ret = futex_wait_multiple(futexv, nr_futexes, timeout ? &to : NULL);
kfree(futexv);
destroy_timer:
if (timeout) { if (timeout) {
hrtimer_cancel(&to.timer); hrtimer_cancel(&to.timer);
destroy_hrtimer_on_stack(&to.timer); destroy_hrtimer_on_stack(&to.timer);
} }
kfree(futexv);
return ret; return ret;
} }