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IB/uverbs: Fix an potential error pointer dereference
[ Upstream commit 26b7d1a ] smatch reports the warning below: drivers/infiniband/core/uverbs_std_types_counters.c:110 ib_uverbs_handler_UVERBS_METHOD_COUNTERS_READ() error: 'uattr' dereferencing possible ERR_PTR() The return value of uattr maybe ERR_PTR(-ENOENT), fix this by checking the value of uattr before using it. Fixes: ebb6796 ("IB/uverbs: Add read counters support") Signed-off-by: Xiang Yang <xiangyang3@huawei.com> Link: https://lore.kernel.org/r/20230804022525.1916766-1-xiangyang3@huawei.com Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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