From 77521be687870e2ecae748df7b8fb103dd57dac2 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 1 Apr 2016 14:17:30 +0200 Subject: [PATCH] netfilter: ip_tables: simplify translate_compat_table args commit 7d3f843eed29222254c9feab481f55175a1afcc9 upstream. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/ipv4/netfilter/ip_tables.c | 59 ++++++++++++++-------------------- 1 file changed, 24 insertions(+), 35 deletions(-) diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index fa06250faf7f..242bf9a6799c 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -1448,7 +1448,6 @@ compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr, static int compat_find_calc_match(struct xt_entry_match *m, - const char *name, const struct ipt_ip *ip, int *size) { @@ -1485,8 +1484,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, const unsigned char *base, const unsigned char *limit, const unsigned int *hook_entries, - const unsigned int *underflows, - const char *name) + const unsigned int *underflows) { struct xt_entry_match *ematch; struct xt_entry_target *t; @@ -1522,7 +1520,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e, entry_offset = (void *)e - (void *)base; j = 0; xt_ematch_foreach(ematch, e) { - ret = compat_find_calc_match(ematch, name, &e->ip, &off); + ret = compat_find_calc_match(ematch, &e->ip, &off); if (ret != 0) goto release_matches; ++j; @@ -1571,7 +1569,7 @@ release_matches: static int compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, - unsigned int *size, const char *name, + unsigned int *size, struct xt_table_info *newinfo, unsigned char *base) { struct xt_entry_target *t; @@ -1654,14 +1652,9 @@ compat_check_entry(struct ipt_entry *e, struct net *net, const char *name) static int translate_compat_table(struct net *net, - const char *name, - unsigned int valid_hooks, struct xt_table_info **pinfo, void **pentry0, - unsigned int total_size, - unsigned int number, - unsigned int *hook_entries, - unsigned int *underflows) + const struct compat_ipt_replace *compatr) { unsigned int i, j; struct xt_table_info *newinfo, *info; @@ -1673,8 +1666,8 @@ translate_compat_table(struct net *net, info = *pinfo; entry0 = *pentry0; - size = total_size; - info->number = number; + size = compatr->size; + info->number = compatr->num_entries; /* Init all hooks to impossible value. */ for (i = 0; i < NF_INET_NUMHOOKS; i++) { @@ -1685,40 +1678,39 @@ translate_compat_table(struct net *net, duprintf("translate_compat_table: size %u\n", info->size); j = 0; xt_compat_lock(AF_INET); - xt_compat_init_offsets(AF_INET, number); + xt_compat_init_offsets(AF_INET, compatr->num_entries); /* Walk through entries, checking offsets. */ - xt_entry_foreach(iter0, entry0, total_size) { + xt_entry_foreach(iter0, entry0, compatr->size) { ret = check_compat_entry_size_and_hooks(iter0, info, &size, entry0, - entry0 + total_size, - hook_entries, - underflows, - name); + entry0 + compatr->size, + compatr->hook_entry, + compatr->underflow); if (ret != 0) goto out_unlock; ++j; } ret = -EINVAL; - if (j != number) { + if (j != compatr->num_entries) { duprintf("translate_compat_table: %u not %u entries\n", - j, number); + j, compatr->num_entries); goto out_unlock; } /* Check hooks all assigned */ for (i = 0; i < NF_INET_NUMHOOKS; i++) { /* Only hooks which are valid */ - if (!(valid_hooks & (1 << i))) + if (!(compatr->valid_hooks & (1 << i))) continue; if (info->hook_entry[i] == 0xFFFFFFFF) { duprintf("Invalid hook entry %u %u\n", - i, hook_entries[i]); + i, info->hook_entry[i]); goto out_unlock; } if (info->underflow[i] == 0xFFFFFFFF) { duprintf("Invalid underflow %u %u\n", - i, underflows[i]); + i, info->underflow[i]); goto out_unlock; } } @@ -1728,17 +1720,17 @@ translate_compat_table(struct net *net, if (!newinfo) goto out_unlock; - newinfo->number = number; + newinfo->number = compatr->num_entries; for (i = 0; i < NF_INET_NUMHOOKS; i++) { newinfo->hook_entry[i] = info->hook_entry[i]; newinfo->underflow[i] = info->underflow[i]; } entry1 = newinfo->entries; pos = entry1; - size = total_size; - xt_entry_foreach(iter0, entry0, total_size) { + size = compatr->size; + xt_entry_foreach(iter0, entry0, compatr->size) { ret = compat_copy_entry_from_user(iter0, &pos, &size, - name, newinfo, entry1); + newinfo, entry1); if (ret != 0) break; } @@ -1748,12 +1740,12 @@ translate_compat_table(struct net *net, goto free_newinfo; ret = -ELOOP; - if (!mark_source_chains(newinfo, valid_hooks, entry1)) + if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1)) goto free_newinfo; i = 0; xt_entry_foreach(iter1, entry1, newinfo->size) { - ret = compat_check_entry(iter1, net, name); + ret = compat_check_entry(iter1, net, compatr->name); if (ret != 0) break; ++i; @@ -1793,7 +1785,7 @@ translate_compat_table(struct net *net, free_newinfo: xt_free_table_info(newinfo); out: - xt_entry_foreach(iter0, entry0, total_size) { + xt_entry_foreach(iter0, entry0, compatr->size) { if (j-- == 0) break; compat_release_entry(iter0); @@ -1838,10 +1830,7 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len) goto free_newinfo; } - ret = translate_compat_table(net, tmp.name, tmp.valid_hooks, - &newinfo, &loc_cpu_entry, tmp.size, - tmp.num_entries, tmp.hook_entry, - tmp.underflow); + ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp); if (ret != 0) goto free_newinfo; -- 2.39.2