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 4733832B125; Sat, 12 Sep 2026 16:23:44 +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=1789230225; cv=none; b=jFgN/Va/82y0X/YfF3guczgCwiAOgSXdvXPL1SBET93H7eruhdOPkd7ShHCDW70peBiccOh5Z6VqJkNImjUA95xiJO7qoYYiEggd3SFFUevgM05UGuFkuU1KAPm/sotneuUuQ60M9aCd6k2YnYKL0/6s1i0T1CQKAWUFGcm9LSA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789230225; c=relaxed/simple; bh=5YD3yStgkVZ8fSnMRb+jszLCEs1x/A/mSzaQBHnTFkQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DlSVsvxmzwD6m2iQBvt1r/kBXzrm4YYwTmzSK9opFe5tOhRtUZUX9S9EKlkBXgAc+wwUZeaxj+5mUyenogmHOlXPJ8rdfclOdqACAUn3gd3tEvT1ctIZiVHOBtoQph+KAo40sc/PVj0xFE7j7hzQqZe//NtMwoURIoBO87TOE0c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ol7nsKZZ; 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="ol7nsKZZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0181F1F000FF; Sat, 12 Sep 2026 16:23:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789230224; bh=a/RmDALmzn9Avd+DopGvBJ/RW+lhaKA65NUJ8DphJ0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ol7nsKZZCpHHfMM2OvkHSsIqSoB+GRaxhyG9danGCYypUFXL8daR7R23YJ4r5SAgq M27Zo5lIXHr2acCC++DSDAP66wp9kKYunLDK7yJE4Y/s/YeC+lzUX3mdlmw5RWojy6 vpBW3o9e7aMhgCKZmb4SZM9JD6/NGAYyRC7l9SnI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Sajal Gupta , Yu Kuai , Sasha Levin Subject: [PATCH 6.1 0751/1191] md/raid5-ppl: fix use-after-free in ppl_do_flush() Date: Sat, 12 Sep 2026 08:57:59 +0200 Message-ID: <20260912065605.148261175@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065548.086904252@linuxfoundation.org> References: <20260912065548.086904252@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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sajal Gupta [ Upstream commit 371f7a1b392edc8b7cf449cc7713179b588f2d0e ] The loop in ppl_do_flush() continues iterating after calling ppl_io_unit_finished(), touching io->pending_flushes and leading to a use-after-free. Add a break statement to stop the loop once io is freed. Fixes: 1532d9e87e8b ("raid5-ppl: PPL support for disks with write-back cache enabled") Reported-by: Dan Carpenter Closes: https://lore.kernel.org/all/ajJF2wKYWRk4GGCK@stanley.mountain/ Signed-off-by: Sajal Gupta Reviewed-by: Yu Kuai Link: https://patch.msgid.link/20260622142146.56637-1-sajal2005gupta@gmail.com Signed-off-by: Yu Kuai Signed-off-by: Sasha Levin --- drivers/md/raid5-ppl.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c index 31b9157bc9ae9..526e94e91358f 100644 --- a/drivers/md/raid5-ppl.c +++ b/drivers/md/raid5-ppl.c @@ -645,8 +645,10 @@ static void ppl_do_flush(struct ppl_io_unit *io) log->disk_flush_bitmap = 0; for (i = flushed_disks ; i < raid_disks; i++) { - if (atomic_dec_and_test(&io->pending_flushes)) + if (atomic_dec_and_test(&io->pending_flushes)) { ppl_io_unit_finished(io); + break; + } } } -- 2.53.0