From 837395aa863142be7c38be0ca780aef21b12b49f Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Sun, 7 Feb 2010 02:11:34 +0100 Subject: [PATCH] netfilter: ebtables: split copy_everything_to_user into two functions once CONFIG_COMPAT support is added to ebtables, the new copy_counters_to_user function can be called instead of duplicating code. Also remove last use of MEMPRINT, as requested by Bart De Schuymer. Signed-off-by: Florian Westphal --- net/bridge/netfilter/ebtables.c | 70 ++++++++++++++++++--------------- 1 file changed, 38 insertions(+), 32 deletions(-) diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index a707dbdc0327..46030dc90845 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -33,11 +33,6 @@ #define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\ "report to author: "format, ## args) /* #define BUGPRINT(format, args...) */ -#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\ - ": out of memory: "format, ## args) -/* #define MEMPRINT(format, args...) */ - - /* * Each cpu has its own set of counters, so there is no need for write_lock in @@ -1263,10 +1258,8 @@ static int update_counters(struct net *net, const void __user *user, if (hlp.num_counters == 0) return -EINVAL; - if (!(tmp = vmalloc(hlp.num_counters * sizeof(*tmp)))) { - MEMPRINT("Update_counters && nomemory\n"); + if (!(tmp = vmalloc(hlp.num_counters * sizeof(*tmp)))) return -ENOMEM; - } t = find_table_lock(net, hlp.name, &ret, &ebt_mutex); if (!t) @@ -1345,14 +1338,46 @@ ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase) return 0; } +static int copy_counters_to_user(struct ebt_table *t, + const struct ebt_counter *oldcounters, + void __user *user, unsigned int num_counters, + unsigned int nentries) +{ + struct ebt_counter *counterstmp; + int ret = 0; + + /* userspace might not need the counters */ + if (num_counters == 0) + return 0; + + if (num_counters != nentries) { + BUGPRINT("Num_counters wrong\n"); + return -EINVAL; + } + + counterstmp = vmalloc(nentries * sizeof(*counterstmp)); + if (!counterstmp) + return -ENOMEM; + + write_lock_bh(&t->lock); + get_counters(oldcounters, counterstmp, nentries); + write_unlock_bh(&t->lock); + + if (copy_to_user(user, counterstmp, + nentries * sizeof(struct ebt_counter))) + ret = -EFAULT; + vfree(counterstmp); + return ret; +} + /* called with ebt_mutex locked */ static int copy_everything_to_user(struct ebt_table *t, void __user *user, const int *len, int cmd) { struct ebt_replace tmp; - struct ebt_counter *counterstmp; const struct ebt_counter *oldcounters; unsigned int entries_size, nentries; + int ret; char *entries; if (cmd == EBT_SO_GET_ENTRIES) { @@ -1388,29 +1413,10 @@ static int copy_everything_to_user(struct ebt_table *t, void __user *user, return -EINVAL; } - /* userspace might not need the counters */ - if (tmp.num_counters) { - if (tmp.num_counters != nentries) { - BUGPRINT("Num_counters wrong\n"); - return -EINVAL; - } - counterstmp = vmalloc(nentries * sizeof(*counterstmp)); - if (!counterstmp) { - MEMPRINT("Couldn't copy counters, out of memory\n"); - return -ENOMEM; - } - write_lock_bh(&t->lock); - get_counters(oldcounters, counterstmp, nentries); - write_unlock_bh(&t->lock); - - if (copy_to_user(tmp.counters, counterstmp, - nentries * sizeof(struct ebt_counter))) { - BUGPRINT("Couldn't copy counters to userspace\n"); - vfree(counterstmp); - return -EFAULT; - } - vfree(counterstmp); - } + ret = copy_counters_to_user(t, oldcounters, tmp.counters, + tmp.num_counters, nentries); + if (ret) + return ret; if (copy_to_user(tmp.entries, entries, entries_size)) { BUGPRINT("Couldn't copy entries to userspace\n"); -- GitLab