RDMA/hns: Fix signed-unsigned mixed comparisons

mainline inclusion
from mainline-v6.7-rc1
commit b5f9efff101b06fd06a5e280a2b00b1335f5f476
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8E9OJ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b5f9efff101b06fd06a5e280a2b00b1335f5f476



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The ib_mtu_enum_to_int() and uverbs_attr_get_len() may returns a negative
value. In this case, mixed comparisons of signed and unsigned types will
throw wrong results.

This patch adds judgement for this situation.

Fixes: 30b70788 ("RDMA/hns: Support inline data in extented sge space for RC")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://lore.kernel.org/r/20231017125239.164455-4-huangjunxian6@hisilicon.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Juan Zhou <zhoujuan51@h-partners.com>