diff options
| author | Chuck Ebbert <76306.1226@compuserve.com> | 2007-01-04 12:17:44 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-01-04 12:17:44 -0800 |
| commit | 44f9a2fdc48ccb8bb510b6e1210bf15b3e10afdb (patch) | |
| tree | d7215dd5b39707affd4ce0e70d313335ffd85611 /net | |
| parent | bbdc176a2f39913063aaaf95bc27e4b18fd14953 (diff) | |
| download | lwn-44f9a2fdc48ccb8bb510b6e1210bf15b3e10afdb.tar.gz lwn-44f9a2fdc48ccb8bb510b6e1210bf15b3e10afdb.zip | |
[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')
| -rw-r--r-- | net/bridge/netfilter/ebtables.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index bee558a41800..6c84ccb8c9d7 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; |