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netfilter: nfnetlink_hook: fix check for snprintf() overflow 

The kernel version of snprintf() can't return negatives.  The
"ret > (int)sizeof(sym)" check is off by one because and it should be
>=.  Finally, we need to set a negative error code.

Fixes: e2cf17d377 ("netfilter: add new hook nfnl subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Dan Carpenter 2021-06-19 16:55:46 +03:00 committed by Pablo Neira Ayuso
parent 3078d964c0
commit 24610ed80d
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/nfnetlink_hook.c
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@ -126,8 +126,10 @@ static int nfnl_hook_dump_one(struct sk_buff *nlskb,
#ifdef CONFIG_KALLSYMS
ret = snprintf(sym, sizeof(sym), "%ps", ops->hook);
if (ret < 0 || ret > (int)sizeof(sym))
if (ret >= sizeof(sym)) {
ret = -EINVAL;
goto nla_put_failure;
}
module_name = strstr(sym, " [");
if (module_name) {