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net: hns3: fix the exception when query imp info
[ Upstream commit 472430a ] When the command for querying imp info is issued to the firmware, if the firmware does not support the command, the returned value of bd num is 0. Add protection mechanism before alloc memory to prevent apply for 0-length memory. Fixes: 0b198b0 ("net: hns3: refactor dump m7 info of debugfs") Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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