From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
Nathan Chancellor <natechancellor@gmail.com>,
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 19/25] s390: ctcm: fix ctcm_new_device error return code
Date: Tue, 7 May 2019 01:41:16 -0400 [thread overview]
Message-ID: <20190507054123.32514-19-sashal@kernel.org> (raw)
In-Reply-To: <20190507054123.32514-1-sashal@kernel.org>
From: Arnd Bergmann <arnd@arndb.de>
[ Upstream commit 27b141fc234a3670d21bd742c35d7205d03cbb3a ]
clang points out that the return code from this function is
undefined for one of the error paths:
../drivers/s390/net/ctcm_main.c:1595:7: warning: variable 'result' is used uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1638:9: note: uninitialized use occurs here
return result;
^~~~~~
../drivers/s390/net/ctcm_main.c:1595:3: note: remove the 'if' if its condition is always false
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1539:12: note: initialize the variable 'result' to silence this warning
int result;
^
Make it return -ENODEV here, as in the related failure cases.
gcc has a known bug in underreporting some of these warnings
when it has already eliminated the assignment of the return code
based on some earlier optimization step.
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/ctcm_main.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index ad17fc5883f6..e22b9ac3e564 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -1595,6 +1595,7 @@ static int ctcm_new_device(struct ccwgroup_device *cgdev)
if (priv->channel[direction] == NULL) {
if (direction == CTCM_WRITE)
channel_free(priv->channel[CTCM_READ]);
+ result = -ENODEV;
goto out_dev;
}
priv->channel[direction]->netdev = dev;
--
2.20.1
next prev parent reply other threads:[~2019-05-07 5:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-07 5:40 [PATCH AUTOSEL 4.9 01/25] iio: adc: xilinx: fix potential use-after-free on remove Sasha Levin
2019-05-07 5:40 ` [PATCH AUTOSEL 4.9 02/25] libnvdimm/namespace: Fix a potential NULL pointer dereference Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 03/25] HID: input: add mapping for Expose/Overview key Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 04/25] HID: input: add mapping for keyboard Brightness Up/Down/Toggle keys Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 05/25] HID: input: add mapping for "Toggle Display" key Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 06/25] libnvdimm/btt: Fix a kmemdup failure check Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 07/25] s390/dasd: Fix capacity calculation for large volumes Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 08/25] mac80211: fix unaligned access in mesh table hash function Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 09/25] Input: snvs_pwrkey - initialize necessary driver data before enabling IRQ Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 10/25] s390/3270: fix lockdep false positive on view->lock Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 11/25] mISDN: Check address length before reading address family Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 12/25] x86/reboot, efi: Use EFI reboot for Acer TravelMate X514-51T Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 13/25] KVM: x86: avoid misreporting level-triggered irqs as edge-triggered in tracing Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 14/25] tools lib traceevent: Fix missing equality check for strcmp Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 15/25] init: initialize jump labels before command line option parsing Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 16/25] selftests: netfilter: check icmp pkttoobig errors are set as related Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 17/25] ipvs: do not schedule icmp errors from tunnels Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 18/25] MIPS: perf: ath79: Fix perfcount IRQ assignment Sasha Levin
2019-06-06 21:28 ` Petr Štetiar
2019-06-09 10:05 ` Greg KH
2019-05-07 5:41 ` Sasha Levin [this message]
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 20/25] drm/sun4i: Set device driver data at bind time for use in unbind Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 21/25] selftests/net: correct the return value for run_netsocktests Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 22/25] gpu: ipu-v3: dp: fix CSC handling Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 23/25] spi: Micrel eth switch: declare missing of table Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 24/25] spi: ST ST95HF NFC: " Sasha Levin
2019-05-07 5:41 ` [PATCH AUTOSEL 4.9 25/25] Input: synaptics-rmi4 - fix possible double free Sasha Levin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190507054123.32514-19-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=arnd@arndb.de \
--cc=davem@davemloft.net \
--cc=jwi@linux.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=natechancellor@gmail.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox