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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2022-12-14 23:20:08 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-12-27 12:52:02 +0100 |
| commit | 94cd8fa09f5f1ebdd4e90964b08b7f2cc4b36c43 (patch) | |
| tree | 32a343b8c47df565e4af74fbf04236053a150f51 /kernel | |
| parent | rtmutex: Add acquire semantics for rtmutex lock acquisition slow path (diff) | |
| download | linux-94cd8fa09f5f1ebdd4e90964b08b7f2cc4b36c43.tar.xz linux-94cd8fa09f5f1ebdd4e90964b08b7f2cc4b36c43.zip | |
futex: Fix futex_waitv() hrtimer debug object leak on kcalloc error
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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/futex/syscalls.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/futex/syscalls.c b/kernel/futex/syscalls.c index 086a22d1adb7..a8074079b09e 100644 --- a/kernel/futex/syscalls.c +++ b/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); - if (!futexv) - return -ENOMEM; + if (!futexv) { + ret = -ENOMEM; + goto destroy_timer; + } ret = futex_parse_waitv(futexv, waiters, nr_futexes); if (!ret) ret = futex_wait_multiple(futexv, nr_futexes, timeout ? &to : NULL); + kfree(futexv); + +destroy_timer: if (timeout) { hrtimer_cancel(&to.timer); destroy_hrtimer_on_stack(&to.timer); } - - kfree(futexv); return ret; } |