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IB/uverbs: Fix an potential error pointer dereference

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[ Upstream commit 26b7d1a27167e7adf75b150755e05d2bc123ce55 ]

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: ebb6796bd3 ("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>
This commit is contained in:
Xiang Yang 2023-08-04 10:25:25 +08:00 committed by Greg Kroah-Hartman
parent 4dca13c30b
commit d020963638
1 changed files with 2 additions and 0 deletions
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drivers/infiniband/core/uverbs_std_types_counters.c
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@ -107,6 +107,8 @@ static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(
return ret;
uattr = uverbs_attr_get(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF);
if (IS_ERR(uattr))
return PTR_ERR(uattr);
read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
read_attr.counters_buff = uverbs_zalloc(
attrs, array_size(read_attr.ncounters, sizeof(u64)));