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Message-Id: <20220408151035.1044701-3-kgraul@linux.ibm.com>
Date: Fri, 8 Apr 2022 17:10:34 +0200
From: Karsten Graul <kgraul@...ux.ibm.com>
To: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
Heiko Carstens <hca@...ux.ibm.com>, alibuda@...ux.alibaba.com
Subject: [PATCH net 2/3] net/smc: Fix NULL pointer dereference in smc_pnet_find_ib()
dev_name() was called with dev.parent as argument but without to
NULL-check it before.
Solve this by checking the pointer before the call to dev_name().
Fixes: af5f60c7e3d5 ("net/smc: allow PCI IDs as ib device names in the pnet table")
Reported-by: syzbot+03e3e228510223dabd34@...kaller.appspotmail.com
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
net/smc/smc_pnet.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
index 7984f8883472..7055ed10e316 100644
--- a/net/smc/smc_pnet.c
+++ b/net/smc/smc_pnet.c
@@ -311,8 +311,9 @@ static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
if (!strncmp(ibdev->ibdev->name, ib_name,
sizeof(ibdev->ibdev->name)) ||
- !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
- IB_DEVICE_NAME_MAX - 1)) {
+ (ibdev->ibdev->dev.parent &&
+ !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
+ IB_DEVICE_NAME_MAX - 1))) {
goto out;
}
}
--
2.32.0
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