From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 68B0C43B3DA; Tue, 21 Jul 2026 21:58:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671117; cv=none; b=AV3RW7bVNEjRK6mwbvFHnthZ9TxKSAY94Oc3R+G+gimEeA10g8nnF8+pOm1Y5JxGmPwCOLcvwg4Jl5pEbTnseT+FTq3SjIt9nhFoz6HsH2Yht0SQhbZQvD3oTKCU+TtDZJCJHz1qPMjDEm01c83cL9payp5Z2DahC+seD6WyEpE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671117; c=relaxed/simple; bh=G/mC79dciedMwr8EHSJ7M0WJUPApcPCKL67UAngxhMU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MIJ1LKY2rbIdzYd0pMWsqOazcnxQ1PcBKANJUyUrpW8gT0JuDlKYjij3FdtpWDeCNEVbiEq8UqFs0U7A4r2XM1zKz+UISiS+9vxVPpHUjDDePbGDsspSkC/CFgmj5axddyoW+6SO9FHmzqUVSi6gpzoBf7Nr8xeoA3zijUOK5nA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aW1Sh5eg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aW1Sh5eg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58E0F1F00A3F; Tue, 21 Jul 2026 21:58:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671108; bh=eFKKBiNrfa1HLwqmKXTmVIjbGi8Last9GQJvhMsxu6c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=aW1Sh5eg41HxtPrRscJ958YS3a7i4cOm8N1x8i+d6w7OEk8neGjpRUg0vAslZHWC6 PZg1VmJJyAQke/RaOkdQDHHnvT92gd2UABA8+H8KdaVDVvi6RP0WbJsR8RvzSLXuvh MVmotkBwMrxcrt7rSbI9/KRMneTrr8mxMWDq1+yE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, WenTao Liang , Thomas Gleixner , Frederic Weisbecker Subject: [PATCH 5.15 120/843] posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path Date: Tue, 21 Jul 2026 17:15:55 +0200 Message-ID: <20260721152408.704940730@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: WenTao Liang commit 87bd2ad568e15b90d5f7d4bcd70342d05dad649c upstream. In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: WenTao Liang Signed-off-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260611161738.97043-1-vulab@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman --- kernel/time/posix-cpu-timers.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -1529,6 +1529,7 @@ static int do_cpu_nanosleep(const clocki spin_lock_irq(&timer.it_lock); error = posix_cpu_timer_set(&timer, flags, &it, NULL); if (error) { + posix_cpu_timer_del(&timer); spin_unlock_irq(&timer.it_lock); return error; }