netfilter: nf_tables: replace BUG_ON by element length check
[ Upstream commit
c39ba4de6b0a843bec5d46c2b6f2064428dada5e ]
BUG_ON can be triggered from userspace with an element with a large
userdata area. Replace it by length check and return EINVAL instead.
Over time extensions have been growing in size.
Pick a sufficiently old Fixes: tag to propagate this fix.
Fixes:
7d7402642eaf ("netfilter: nf_tables: variable sized set element keys / data")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>