jfs: don't walk off the end of ealist

stable inclusion
from stable-v4.19.319
commit 7f91bd0f2941fa36449ce1a15faaa64f840d9746
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAG918
CVE: CVE-2024-41017

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7f91bd0f2941fa36449ce1a15faaa64f840d9746



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commit d0fa70aca54c8643248e89061da23752506ec0d4 upstream.

Add a check before visiting the members of ea to
make sure each ea stays within the ealist.

Signed-off-by: lei lu <llfamsec@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Zhao Wenhui <zhaowenhui8@huawei.com>