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idr: Fix idr_alloc_u32 on 32-bit systems
[ Upstream commit b7e9728f3d
]
Attempting to allocate an entry at 0xffffffff when one is already
present would succeed in allocating one at 2^32, which would confuse
everything. Return -ENOSPC in this case, as expected.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -2184,7 +2184,7 @@ void __rcu **idr_get_free_cmn(struct radix_tree_root *root,
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offset = radix_tree_find_next_bit(node, IDR_FREE,
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offset + 1);
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start = next_index(start, node, offset);
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if (start > max)
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if (start > max || start == 0)
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return ERR_PTR(-ENOSPC);
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while (offset == RADIX_TREE_MAP_SIZE) {
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offset = node->offset + 1;
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