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net/smc: Fix NULL pointer dereference in smc_pnet_find_ib()

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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: af5f60c7e3 ("net/smc: allow PCI IDs as ib device names in the pnet table")
Reported-by: syzbot+03e3e228510223dabd34@syzkaller.appspotmail.com
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Karsten Graul 2022-04-08 17:10:34 +02:00 committed by Jakub Kicinski
parent b1871fd48e
commit d22f4f9772
1 changed files with 3 additions and 2 deletions
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5
net/smc/smc_pnet.c
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@ -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;
}
}