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Subject[net PATCH v1 1/2] net: netprio: fix files lock and remove useless d_path bits
Date
Add lock to prevent a race with a file closing and also remove
useless and ugly sscanf code. The extra code was never needed
and the case it supposedly protected against is in fact handled
correctly by sock_from_file as pointed out by Al Viro.

CC: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
---

net/core/netprio_cgroup.c | 15 ++++-----------
1 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index ed0c043..0323ec3 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -296,29 +296,22 @@ void net_prio_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
continue;
}

- rcu_read_lock();
+ spin_lock(&files->file_lock);
fdt = files_fdtable(files);
for (fd = 0; fd < fdt->max_fds; fd++) {
- char *path;
struct file *file;
struct socket *sock;
- unsigned long s;
- int rv, err = 0;
+ int err;

file = fcheck_files(files, fd);
if (!file)
continue;

- path = d_path(&file->f_path, tmp, PAGE_SIZE);
- rv = sscanf(path, "socket:[%lu]", &s);
- if (rv <= 0)
- continue;
-
sock = sock_from_file(file, &err);
- if (!err)
+ if (sock)
sock_update_netprioidx(sock->sk, p);
}
- rcu_read_unlock();
+ spin_unlock(&files->file_lock);
task_unlock(p);
}
kfree(tmp);


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