From 18a9d8f5228f1212d7c942b6c2f5957d4e4cdffb Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 1 Apr 2016 14:17:33 +0200 Subject: [PATCH] netfilter: x_tables: xt_compat_match_from_user doesn't need a retval commit 0188346f21e6546498c2a0f84888797ad4063fc5 upstream. Always returned 0. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- include/linux/netfilter/x_tables.h | 2 +- net/ipv4/netfilter/arp_tables.c | 17 +++++------------ net/ipv4/netfilter/ip_tables.c | 26 +++++++++----------------- net/ipv6/netfilter/ip6_tables.c | 27 +++++++++------------------ net/netfilter/x_tables.c | 5 ++--- 5 files changed, 26 insertions(+), 51 deletions(-) diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index 30cfb1e943fb..e2da9b90f1b8 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -484,7 +484,7 @@ void xt_compat_init_offsets(u_int8_t af, unsigned int number); int xt_compat_calc_jump(u_int8_t af, unsigned int offset); int xt_compat_match_offset(const struct xt_match *match); -int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, +void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, unsigned int *size); int xt_compat_match_to_user(const struct xt_entry_match *m, void __user **dstptr, unsigned int *size); diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index 1d1386dc159b..be514c676fad 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -1310,7 +1310,7 @@ out: return ret; } -static int +static void compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, unsigned int *size, struct xt_table_info *newinfo, unsigned char *base) @@ -1319,9 +1319,8 @@ compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, struct xt_target *target; struct arpt_entry *de; unsigned int origsize; - int ret, h; + int h; - ret = 0; origsize = *size; de = (struct arpt_entry *)*dstptr; memcpy(de, e, sizeof(struct arpt_entry)); @@ -1342,7 +1341,6 @@ compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr, if ((unsigned char *)de - base < newinfo->underflow[h]) newinfo->underflow[h] -= origsize - *size; } - return ret; } static int translate_compat_table(struct xt_table_info **pinfo, @@ -1421,16 +1419,11 @@ static int translate_compat_table(struct xt_table_info **pinfo, entry1 = newinfo->entries; pos = entry1; size = compatr->size; - xt_entry_foreach(iter0, entry0, compatr->size) { - ret = compat_copy_entry_from_user(iter0, &pos, &size, - newinfo, entry1); - if (ret != 0) - break; - } + xt_entry_foreach(iter0, entry0, compatr->size) + compat_copy_entry_from_user(iter0, &pos, &size, + newinfo, entry1); xt_compat_flush_offsets(NFPROTO_ARP); xt_compat_unlock(NFPROTO_ARP); - if (ret) - goto free_newinfo; ret = -ELOOP; if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1)) diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index d70418604503..5c20eef980c1 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -1568,7 +1568,7 @@ release_matches: return ret; } -static int +static void compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, unsigned int *size, struct xt_table_info *newinfo, unsigned char *base) @@ -1577,10 +1577,9 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, struct xt_target *target; struct ipt_entry *de; unsigned int origsize; - int ret, h; + int h; struct xt_entry_match *ematch; - ret = 0; origsize = *size; de = (struct ipt_entry *)*dstptr; memcpy(de, e, sizeof(struct ipt_entry)); @@ -1589,11 +1588,9 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, *dstptr += sizeof(struct ipt_entry); *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry); - xt_ematch_foreach(ematch, e) { - ret = xt_compat_match_from_user(ematch, dstptr, size); - if (ret != 0) - return ret; - } + xt_ematch_foreach(ematch, e) + xt_compat_match_from_user(ematch, dstptr, size); + de->target_offset = e->target_offset - (origsize - *size); t = compat_ipt_get_target(e); target = t->u.kernel.target; @@ -1606,7 +1603,6 @@ compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr, if ((unsigned char *)de - base < newinfo->underflow[h]) newinfo->underflow[h] -= origsize - *size; } - return ret; } static int @@ -1729,16 +1725,12 @@ translate_compat_table(struct net *net, entry1 = newinfo->entries; pos = entry1; size = compatr->size; - xt_entry_foreach(iter0, entry0, compatr->size) { - ret = compat_copy_entry_from_user(iter0, &pos, &size, - newinfo, entry1); - if (ret != 0) - break; - } + xt_entry_foreach(iter0, entry0, compatr->size) + compat_copy_entry_from_user(iter0, &pos, &size, + newinfo, entry1); + xt_compat_flush_offsets(AF_INET); xt_compat_unlock(AF_INET); - if (ret) - goto free_newinfo; ret = -ELOOP; if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1)) diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index 8d082c557771..620d54c1c119 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -1580,7 +1580,7 @@ release_matches: return ret; } -static int +static void compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, unsigned int *size, struct xt_table_info *newinfo, unsigned char *base) @@ -1588,10 +1588,9 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, struct xt_entry_target *t; struct ip6t_entry *de; unsigned int origsize; - int ret, h; + int h; struct xt_entry_match *ematch; - ret = 0; origsize = *size; de = (struct ip6t_entry *)*dstptr; memcpy(de, e, sizeof(struct ip6t_entry)); @@ -1600,11 +1599,9 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, *dstptr += sizeof(struct ip6t_entry); *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry); - xt_ematch_foreach(ematch, e) { - ret = xt_compat_match_from_user(ematch, dstptr, size); - if (ret != 0) - return ret; - } + xt_ematch_foreach(ematch, e) + xt_compat_match_from_user(ematch, dstptr, size); + de->target_offset = e->target_offset - (origsize - *size); t = compat_ip6t_get_target(e); xt_compat_target_from_user(t, dstptr, size); @@ -1616,7 +1613,6 @@ compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr, if ((unsigned char *)de - base < newinfo->underflow[h]) newinfo->underflow[h] -= origsize - *size; } - return ret; } static int compat_check_entry(struct ip6t_entry *e, struct net *net, @@ -1737,17 +1733,12 @@ translate_compat_table(struct net *net, } entry1 = newinfo->entries; pos = entry1; - size = compatr->size; - xt_entry_foreach(iter0, entry0, compatr->size) { - ret = compat_copy_entry_from_user(iter0, &pos, &size, - newinfo, entry1); - if (ret != 0) - break; - } + xt_entry_foreach(iter0, entry0, compatr->size) + compat_copy_entry_from_user(iter0, &pos, &size, + newinfo, entry1); + xt_compat_flush_offsets(AF_INET6); xt_compat_unlock(AF_INET6); - if (ret) - goto free_newinfo; ret = -ELOOP; if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1)) diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index 69c9692fa7fc..1fb6ac94910d 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -526,8 +526,8 @@ int xt_compat_match_offset(const struct xt_match *match) } EXPORT_SYMBOL_GPL(xt_compat_match_offset); -int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, - unsigned int *size) +void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, + unsigned int *size) { const struct xt_match *match = m->u.kernel.match; struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m; @@ -549,7 +549,6 @@ int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, *size += off; *dstptr += msize; - return 0; } EXPORT_SYMBOL_GPL(xt_compat_match_from_user); -- 2.11.4.GIT