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RDMA/rxe: Fix the parent sysfs read when the interface has 15 chars 

commit 60b1af64eb upstream.

'parent' sysfs reads will yield '\0' bytes when the interface name has 15
chars, and there will no "\n" output.

To reproduce, create one interface with 15 chars:

 [root@test ~]# ip a s enp0s29u1u7u3c2
 2: enp0s29u1u7u3c2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
     link/ether 02:21:28:57:47:17 brd ff:ff:ff:ff:ff:ff
     inet6 fe80::ac41:338f:5bcd:c222/64 scope link noprefixroute
        valid_lft forever preferred_lft forever
 [root@test ~]# modprobe rdma_rxe
 [root@test ~]# echo enp0s29u1u7u3c2 > /sys/module/rdma_rxe/parameters/add
 [root@test ~]# cat /sys/class/infiniband/rxe0/parent
 enp0s29u1u7u3c2[root@test ~]#
 [root@test ~]# f="/sys/class/infiniband/rxe0/parent"
 [root@test ~]# echo "$(<"$f")"
 -bash: warning: command substitution: ignored null byte in input
 enp0s29u1u7u3c2

Use scnprintf and PAGE_SIZE to fill the sysfs output buffer.

Cc: stable@vger.kernel.org
Fixes: 8700e3e7c4 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20200820153646.31316-1-yi.zhang@redhat.com
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Yi Zhang <yi.zhang@redhat.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yi Zhang 2020-08-20 23:36:46 +08:00 committed by Greg Kroah-Hartman
parent ea3d3bf856
commit 616a0c13e4
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/sw/rxe/rxe_verbs.c
View File

@ -1078,7 +1078,7 @@ static ssize_t parent_show(struct device *device,
struct rxe_dev *rxe =
rdma_device_to_drv_device(device, struct rxe_dev, ib_dev);
return snprintf(buf, 16, "%s\n", rxe_parent_name(rxe, 1));
return scnprintf(buf, PAGE_SIZE, "%s\n", rxe_parent_name(rxe, 1));
}
static DEVICE_ATTR_RO(parent);