patches for DPDK stable branches
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From: Kevin Traynor <ktraynor@redhat.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Qi Zhang <qi.z.zhang@intel.com>, dpdk stable <stable@dpdk.org>
Subject: [dpdk-stable] patch 'net/iavf: fix uninitialized variable' has been queued to LTS release 18.11.10
Date: Thu, 20 Aug 2020 16:33:17 +0100
Message-ID: <20200820153341.171927-12-ktraynor@redhat.com> (raw)
In-Reply-To: <20200820153341.171927-1-ktraynor@redhat.com>

Hi,

FYI, your patch has been queued to LTS release 18.11.10

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/25/20. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable-queue/commit/af7961c247910bf9cde1872823626e262d4c9905

Thanks.

Kevin.

---
From af7961c247910bf9cde1872823626e262d4c9905 Mon Sep 17 00:00:00 2001
From: Ferruh Yigit <ferruh.yigit@intel.com>
Date: Tue, 23 Jun 2020 14:45:31 +0100
Subject: [PATCH] net/iavf: fix uninitialized variable
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

[ upstream commit ca5e39f8535300b247d14865cd8c6b9b4acba38a ]

This is observed with experimental gcc 11, although the older gcc
versions don't complain about it, issue seems a valid one.
gcc version 11.0.0 20200621 (experimental) (GCC)

Build error
.../drivers/net/iavf/iavf_ethdev.c: In function ‘iavf_dev_link_update’:
.../drivers/net/iavf/iavf_ethdev.c:641:6:
    error: ‘new_link’ is used uninitialized [-Werror=uninitialized]
  641 |  if (rte_atomic64_cmpset((uint64_t *)&dev->data->dev_link,
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  642 |     *(uint64_t *)&dev->data->dev_link,
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  643 |     *(uint64_t *)&new_link) == 0)
      |     ~~~~~~~~~~~~~~~~~~~~~~~
.../drivers/net/iavf/iavf_ethdev.c:596:22:
    note: ‘new_link’ declared here
  596 |  struct rte_eth_link new_link;
      |                      ^~~~~~~~
cc1: all warnings being treated as error

All fields of the 'new_link' struct is already set in function, so the
'uninitialized' warning is hard to get. This is because the combination
of aligning and bitfield usage of the struct

The definition of the struct is:
struct rte_eth_link {
        uint32_t link_speed;        /**< ETH_SPEED_NUM_ */
        uint16_t link_duplex  : 1;  /**< ETH_LINK_[HALF/FULL]_DUPLEX */
        uint16_t link_autoneg : 1;  /**< ETH_LINK_[AUTONEG/FIXED] */
        uint16_t link_status  : 1;  /**< ETH_LINK_[DOWN/UP] */
} __rte_aligned(8);      /**< aligned for atomic64 read/write */

Overall the size of the 'struct rte_eth_link' is 64 bits, but function
only sets the 35 bits of it, because only 3 bits of 16 bits variable are
used.
When the struct cast to 'uint64_t' because of the 'rte_atomic64_cmpset'
the upper 29 bits are used without initialization.

To fix the uninitialized usage, memset the variable 'new_link' before
using it.

Fixes: 48de41ca11f0 ("net/avf: enable link status update")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
---
 drivers/net/avf/avf_ethdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/avf/avf_ethdev.c b/drivers/net/avf/avf_ethdev.c
index 8000e9c70d..0ab468904c 100644
--- a/drivers/net/avf/avf_ethdev.c
+++ b/drivers/net/avf/avf_ethdev.c
@@ -581,4 +581,6 @@ avf_dev_link_update(struct rte_eth_dev *dev,
 	struct avf_info *vf = AVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 
+	memset(&new_link, 0, sizeof(new_link));
+
 	/* Only read status info stored in VF, and the info is updated
 	 *  when receive LINK_CHANGE evnet from PF by Virtchnnl.
-- 
2.26.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2020-08-20 16:26:16.339157367 +0100
+++ 0012-net-iavf-fix-uninitialized-variable.patch	2020-08-20 16:26:15.786323979 +0100
@@ -1 +1 @@
-From ca5e39f8535300b247d14865cd8c6b9b4acba38a Mon Sep 17 00:00:00 2001
+From af7961c247910bf9cde1872823626e262d4c9905 Mon Sep 17 00:00:00 2001
@@ -8,0 +9,2 @@
+[ upstream commit ca5e39f8535300b247d14865cd8c6b9b4acba38a ]
+
@@ -51 +52,0 @@
-Cc: stable@dpdk.org
@@ -56 +57 @@
- drivers/net/iavf/iavf_ethdev.c | 2 ++
+ drivers/net/avf/avf_ethdev.c | 2 ++
@@ -59,6 +60,6 @@
-diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
-index d69e5284ed..b0dd49a8da 100644
---- a/drivers/net/iavf/iavf_ethdev.c
-+++ b/drivers/net/iavf/iavf_ethdev.c
-@@ -583,4 +583,6 @@ iavf_dev_link_update(struct rte_eth_dev *dev,
- 	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+diff --git a/drivers/net/avf/avf_ethdev.c b/drivers/net/avf/avf_ethdev.c
+index 8000e9c70d..0ab468904c 100644
+--- a/drivers/net/avf/avf_ethdev.c
++++ b/drivers/net/avf/avf_ethdev.c
+@@ -581,4 +581,6 @@ avf_dev_link_update(struct rte_eth_dev *dev,
+ 	struct avf_info *vf = AVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);


  parent reply	other threads:[~2020-08-20 15:34 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-20 15:33 [dpdk-stable] patch 'test: fix rpath for drivers with meson' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'rawdev: allow getting info for unknown device' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'rawdev: fill NUMA socket ID in info' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'rawdev: export dump function in map file' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'cfgfile: fix stack buffer underflow' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'drivers/crypto: add missing OOP feature flag' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'test/crypto: fix asymmetric session mempool creation' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'common/cpt: fix encryption offset' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'crypto/dpaax_sec: fix inline query for descriptors' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'service: fix core mapping reset' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/ixgbe: report 10Mbps link speed for x553' " Kevin Traynor
2020-08-20 15:33 ` Kevin Traynor [this message]
2020-08-20 15:33 ` [dpdk-stable] patch 'net/ixgbe/base: remove dead code' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/i40e: fix getting EEPROM information' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'app/testpmd: use clock time in throughput calculation' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'app/testpmd: fix burst percentage " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'ethdev: fix log type for some error messages' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'service: fix C++ linkage' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net: fix unneeded replacement of TCP checksum 0' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net: fix checksum on big endian CPUs' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'eal: fix parentheses in alignment macros' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'vhost: fix virtio ready flag check' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'bus/fslmc: fix getting FD error' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/dpaa: fix FD offset data type' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/bonding: fix socket ID check' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/netvsc: fix underflow when Rx external mbuf' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/ixgbe/base: fix host interface shadow RAM read' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/ixgbe/base: fix x550em 10G NIC link status' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/ixgbe/base: fix infinite recursion on PCIe link down' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'ethdev: fix data room size verification in Rx queue setup' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/nfp: fix RSS hash configuration reporting' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'drivers/net: fix exposing internal headers' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/bonding: fix LACP negotiation' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'net/bnxt: remove unused enum declaration' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'examples/fips_validation: fix parsing of TDES vectors' " Kevin Traynor
2020-08-20 15:33 ` [dpdk-stable] patch 'examples/fips_validation: fix count overwrite for TDES' " Kevin Traynor

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