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    Subject[PATCH 4.16 22/26] netfilter: x_tables: limit allocation requests for blob rule heads
    Date
    4.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Florian Westphal <fw@strlen.de>

    commit 9d5c12a7c08f67999772065afd50fb222072114e upstream.

    This is a very conservative limit (134217728 rules), but good
    enough to not trigger frequent oom from syzkaller.

    Signed-off-by: Florian Westphal <fw@strlen.de>
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/netfilter/x_tables.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/net/netfilter/x_tables.c
    +++ b/net/netfilter/x_tables.c
    @@ -818,6 +818,9 @@ EXPORT_SYMBOL(xt_check_entry_offsets);
    */
    unsigned int *xt_alloc_entry_offsets(unsigned int size)
    {
    + if (size > XT_MAX_TABLE_SIZE / sizeof(unsigned int))
    + return NULL;
    +
    return kvmalloc_array(size, sizeof(unsigned int), GFP_KERNEL | __GFP_ZERO);

    }

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