perf: Fix perf_event_validate_size()

stable inclusion
from stable-v4.19.302
commit f5d6ab016792c9d6d5280fdb7f8962eb3b8c620e
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I8PT55
CVE: CVE-2023-6931

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f5d6ab016792c9d6d5280fdb7f8962eb3b8c620e



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[ Upstream commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b ]

Budimir noted that perf_event_validate_size() only checks the size of
the newly added event, even though the sizes of all existing events
can also change due to not all events having the same read_format.

When we attach the new event, perf_group_attach(), we do re-compute
the size for all events.

Fixes: a723968c ("perf: Fix u16 overflows")
Reported-by: Budimir Markovic <markovicbudimir@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>