netfilter: nft_set_pipapo: Actually validate intervals in fields after the first one

stable inclusion
from stable-v5.10.159
commit a0418d0a6b2d38e14296ad02ab13fd2f960212d2
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a0418d0a6b2d38e14296ad02ab13fd2f960212d2



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

[ Upstream commit 97d4d394 ]

Embarrassingly, nft_pipapo_insert() checked for interval validity in
the first field only.

The start_p and end_p pointers were reset to key data from the first
field at every iteration of the loop which was supposed to go over
the set fields.

Fixes: 3c4287f6 ("nf_tables: Add set type for arbitrary concatenation of ranges")
Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>