net: hns3: fix out-of-bounds access may occur when coalesce info is read via debugfs

maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8GVK7
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=53aba458f23846112c0d44239580ff59bc5c36c3



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The hns3 driver define an array of string to show the coalesce
info, but if the kernel adds a new mode or a new state,
out-of-bounds access may occur when coalesce info is read via
debugfs, this patch fix the problem.

Fixes: c99fead7 ("net: hns3: add debugfs support for interrupt coalesce")
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiantao Xiao <xiaojiantao1@h-partners.com>