From 63395b65972c07edce595c9cc8a983016738cdac Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 12 Nov 2009 00:35:55 -0800 Subject: sysctl: sysctl_binary.c Fix compilation when !CONFIG_NET dev_get_by_index does not exist when the network stack is not compiled in, so only include the code to follow wild card paths when the network stack is present. I have shuffled the code around a little to make it clear that dev_put is called after dev_get_by_index showing that there is no leak. Signed-off-by: Eric W. Biederman --- kernel/sysctl_binary.c | 35 ++++++++++++++++++++--------------- 1 file changed, 20 insertions(+), 15 deletions(-) (limited to 'kernel/sysctl_binary.c') diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c index bf0a4b06782..0cf60400542 100644 --- a/kernel/sysctl_binary.c +++ b/kernel/sysctl_binary.c @@ -12,6 +12,7 @@ #include #include #include +#include #ifdef CONFIG_SYSCTL_SYSCALL @@ -1250,9 +1251,12 @@ out: static const struct bin_table *get_sysctl(const int *name, int nlen, char *path) { const struct bin_table *table = &bin_root_table[0]; - struct net *net = current->nsproxy->net_ns; int ctl_name; + /* The binary sysctl tables have a small maximum depth so + * there is no danger of overflowing our path as it PATH_MAX + * bytes long. + */ memcpy(path, "sys/", 4); path += 4; @@ -1263,30 +1267,31 @@ repeat: name++; nlen--; for ( ; table->convert; table++) { - struct net_device *dev = NULL; - const char *procname = NULL; + int len = 0; /* Use the well known sysctl number to proc name mapping */ - if (ctl_name == table->ctl_name) - procname = table->procname; - + if (ctl_name == table->ctl_name) { + len = strlen(table->procname); + memcpy(path, table->procname, len); + } +#ifdef CONFIG_NET /* * For a wild card entry map from ifindex to network * device name. */ else if (!table->ctl_name) { + struct net *net = current->nsproxy->net_ns; + struct net_device *dev; dev = dev_get_by_index(net, ctl_name); - if (dev) - procname = dev->name; + if (dev) { + len = strlen(dev->name); + memcpy(path, dev->name, len); + dev_put(dev); + } } - if (procname) { - int len; - - len = strlen(procname); - memcpy(path, procname, len); +#endif + if (len) { path += len; - if (dev) - dev_put(dev); if (table->child) { *path++ = '/'; table = table->child; -- cgit v1.2.3-70-g09d2