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Subject[patch 42/50] ebtables: dont compute gap before checking struct type
-stable review patch.  If anyone has any objections, please let us know.
------------------

From: Chuck Ebbert <76306.1226@compuserve.com>

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>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
net/bridge/netfilter/ebtables.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.19.1.orig/net/bridge/netfilter/ebtables.c
+++ linux-2.6.19.1/net/bridge/netfilter/ebtables.c
@@ -575,7 +575,7 @@ ebt_check_entry(struct ebt_entry *e, str
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 */
@@ -625,6 +625,7 @@ ebt_check_entry(struct ebt_entry *e, str
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;
--
-
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