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authorChuck Ebbert <76306.1226@compuserve.com>2007-01-04 12:17:44 -0800
committerDavid S. Miller <davem@davemloft.net>2007-01-04 12:17:44 -0800
commit44f9a2fdc48ccb8bb510b6e1210bf15b3e10afdb (patch)
treed7215dd5b39707affd4ce0e70d313335ffd85611 /net/bridge
parentbbdc176a2f39913063aaaf95bc27e4b18fd14953 (diff)
[NETFILTER]: ebtables: don't compute gap before checking struct type
We cannot compute the gap until we know we have a 'struct ebt_entry' and not 'struct ebt_entries'. Failure to check can cause crash. Tested-by: Santiago Garcia Mantinan <manty@manty.net> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/netfilter/ebtables.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index bee558a4180..6c84ccb8c9d 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -610,7 +610,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
struct ebt_entry_target *t;
struct ebt_target *target;
unsigned int i, j, hook = 0, hookmask = 0;
- size_t gap = e->next_offset - e->target_offset;
+ size_t gap;
int ret;
/* don't mess with the struct ebt_entries */
@@ -660,6 +660,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
if (ret != 0)
goto cleanup_watchers;
t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
+ gap = e->next_offset - e->target_offset;
target = find_target_lock(t->u.name, &ret, &ebt_mutex);
if (!target)
goto cleanup_watchers;