Smatch complains that we copy too much data to the user in ebtables.
We copied EBT_FUNCTION_MAXNAMELEN (32) characters to the user here, but
"m->u.match->name" has XT_EXTENSION_MAXNAMELEN (29) characters.
I'm not sure if this is a bug where someone got confused with m->u.name
which has 32 characters or if this is done for backwards compatability.
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 59ca00e..6bcb31d 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1323,7 +1323,7 @@ static inline int ebt_make_matchname(const struct ebt_entry_match *m,
const char *base, char __user *ubase)
{
char __user *hlp = ubase + ((char *)m - base);
- if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
+ if (copy_to_user(hlp, m->u.match->name, XT_EXTENSION_MAXNAMELEN))
return -EFAULT;
return 0;
}
@@ -1332,7 +1332,7 @@ static inline int ebt_make_watchername(const struct ebt_entry_watcher *w,
const char *base, char __user *ubase)
{
char __user *hlp = ubase + ((char *)w - base);
- if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
+ if (copy_to_user(hlp , w->u.watcher->name, XT_EXTENSION_MAXNAMELEN))
return -EFAULT;
return 0;
}
@@ -1356,7 +1356,7 @@ ebt_make_names(struct ebt_entry *e, const char *base, char __user *ubase)
ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
if (ret != 0)
return ret;
- if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
+ if (copy_to_user(hlp, t->u.target->name, XT_EXTENSION_MAXNAMELEN))
return -EFAULT;
return 0;
}
--
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