From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Julian Wiedmann <jwi@linux.ibm.com>,
"David S . Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>,
linux-s390@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 14/19] s390/qeth: fix use-after-free in error path
Date: Thu, 28 Feb 2019 10:15:10 -0500 [thread overview]
Message-ID: <20190228151517.12705-14-sashal@kernel.org> (raw)
In-Reply-To: <20190228151517.12705-1-sashal@kernel.org>
From: Julian Wiedmann <jwi@linux.ibm.com>
[ Upstream commit afa0c5904ba16d59b0454f7ee4c807dae350f432 ]
The error path in qeth_alloc_qdio_buffers() that takes care of
cleaning up the Output Queues is buggy. It first frees the queue, but
then calls qeth_clear_outq_buffers() with that very queue struct.
Make the call to qeth_clear_outq_buffers() part of the free action
(in the correct order), and while at it fix the naming of the helper.
Fixes: 0da9581ddb0f ("qeth: exploit asynchronous delivery of storage blocks")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/qeth_core_main.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 8f77fc0630ce0..86a02592b982c 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2449,11 +2449,12 @@ static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *q, int bidx)
return rc;
}
-static void qeth_free_qdio_out_buf(struct qeth_qdio_out_q *q)
+static void qeth_free_output_queue(struct qeth_qdio_out_q *q)
{
if (!q)
return;
+ qeth_clear_outq_buffers(q, 1);
qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q);
kfree(q);
}
@@ -2526,10 +2527,8 @@ static int qeth_alloc_qdio_buffers(struct qeth_card *card)
card->qdio.out_qs[i]->bufs[j] = NULL;
}
out_freeoutq:
- while (i > 0) {
- qeth_free_qdio_out_buf(card->qdio.out_qs[--i]);
- qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
- }
+ while (i > 0)
+ qeth_free_output_queue(card->qdio.out_qs[--i]);
kfree(card->qdio.out_qs);
card->qdio.out_qs = NULL;
out_freepool:
@@ -2562,10 +2561,8 @@ static void qeth_free_qdio_buffers(struct qeth_card *card)
qeth_free_buffer_pool(card);
/* free outbound qdio_qs */
if (card->qdio.out_qs) {
- for (i = 0; i < card->qdio.no_out_queues; ++i) {
- qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
- qeth_free_qdio_out_buf(card->qdio.out_qs[i]);
- }
+ for (i = 0; i < card->qdio.no_out_queues; i++)
+ qeth_free_output_queue(card->qdio.out_qs[i]);
kfree(card->qdio.out_qs);
card->qdio.out_qs = NULL;
}
--
2.19.1
next prev parent reply other threads:[~2019-02-28 15:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 15:14 [PATCH AUTOSEL 4.9 01/19] soc: fsl: qbman: avoid race in clearing QMan interrupt Sasha Levin
2019-02-28 15:14 ` [PATCH AUTOSEL 4.9 02/19] ARM: pxa: ssp: unneeded to free devm_ allocated data Sasha Levin
2019-02-28 15:14 ` [PATCH AUTOSEL 4.9 03/19] arm64: dts: add msm8996 compatible to gicv3 Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 04/19] usb: phy: fix link errors Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 05/19] irqchip/mmp: Only touch the PJ4 IRQ & FIQ bits on enable/disable Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 06/19] drm/sun4i: tcon: Prepare and enable TCON channel 0 clock at init Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 07/19] dmaengine: at_xdmac: Fix wrongfull report of a channel as in use Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 08/19] vsock/virtio: fix kernel panic after device hot-unplug Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 09/19] vsock/virtio: reset connected sockets on device removal Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 10/19] dmaengine: dmatest: Abort test in case of mapping error Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 11/19] selftests: netfilter: fix config fragment CONFIG_NF_TABLES_INET Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 12/19] selftests: netfilter: add simple masq/redirect test cases Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 13/19] netfilter: nf_nat: skip nat clash resolution for same-origin entries Sasha Levin
2019-02-28 15:15 ` Sasha Levin [this message]
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 15/19] perf symbols: Filter out hidden symbols from labels Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 16/19] perf trace: Support multiple "vfs_getname" probes Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 17/19] MIPS: Loongson: Introduce and use loongson_llsc_mb() Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 18/19] MIPS: Remove function size check in get_frame_info() Sasha Levin
2019-02-28 15:15 ` [PATCH AUTOSEL 4.9 19/19] fs: ratelimit __find_get_block_slow() failure message Sasha Levin
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