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netfilter: x_tables: make sure compat af mutex is held 

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-02-27 19:42:36 +01:00 committed by Pablo Neira Ayuso
parent 7d7d7e0211
commit 8937086068
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/x_tables.c
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@ -582,6 +582,8 @@ int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta)
{
struct xt_af *xp = &xt[af];
WARN_ON(!mutex_is_locked(&xt[af].compat_mutex));
if (WARN_ON(!xp->compat_tab))
return -ENOMEM;
@ -599,6 +601,8 @@ EXPORT_SYMBOL_GPL(xt_compat_add_offset);
void xt_compat_flush_offsets(u_int8_t af)
{
WARN_ON(!mutex_is_locked(&xt[af].compat_mutex));
if (xt[af].compat_tab) {
vfree(xt[af].compat_tab);
xt[af].compat_tab = NULL;
@ -630,6 +634,8 @@ int xt_compat_init_offsets(u8 af, unsigned int number)
{
size_t mem;
WARN_ON(!mutex_is_locked(&xt[af].compat_mutex));
if (!number || number > (INT_MAX / sizeof(struct compat_delta)))
return -EINVAL;