clk: socfpga: agilex: Add bounds-checking coverage for struct stratix10_clock_data

In order to gain the bounds-checking coverage that __counted_by provides
to flexible-array members at run-time via CONFIG_UBSAN_BOUNDS (for array
indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions),
we must make sure that the counter member, in this case `num`, is updated
before the first access to the flex-array member, in this case array `hws`.

commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with
__counted_by") introduced `__counted_by` for `struct clk_hw_onecell_data`
together with changes to relocate some of assignments of counter `num`
before `hws` is accessed:

include/linux/clk-provider.h:
1380 struct clk_hw_onecell_data {
1381 unsigned int num;
1382 struct clk_hw *hws[] __counted_by(num);
1383 };

However, this structure is used as a member in other structs, in this
case in `struct sstratix10_clock_data`:

drivers/clk/socfpga/stratix10-clk.h:
9 struct stratix10_clock_data {
10 void __iomem *base;
11
12 /* Must be last */
13 struct clk_hw_onecell_data clk_data;
14 };

Hence, we need to move the assignments to `clk_data->clk_data.num` after
allocations for `struct stratix10_clock_data` and before accessing the
flexible array `clk_data->clk_data.hws`. And, as assignments for both
`clk_data->clk_data.num` and `clk_data->base` are originally adjacent to
each other, relocate both assignments together.

Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Link: https://lore.kernel.org/r/38[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/socfpga/clk-agilex.c

···
 	if (!clk_data)
 		return -ENOMEM;
 
+	clk_data->clk_data.num = num_clks;
+	clk_data->base = base;
+
 	for (i = 0; i < num_clks; i++)
 		clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
-
-	clk_data->base = base;
-	clk_data->clk_data.num = num_clks;
 
 	agilex_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data);
 
···
 	if (!clk_data)
 		return -ENOMEM;
 
-	for (i = 0; i < num_clks; i++)
-		clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
-
 	clk_data->base = base;
 	clk_data->clk_data.num = num_clks;
+
+	for (i = 0; i < num_clks; i++)
+		clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
 
 	n5x_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data);
 

drivers/clk/socfpga/clk-s10.c

···
 	if (!clk_data)
 		return -ENOMEM;
 
-	for (i = 0; i < num_clks; i++)
-		clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
-
 	clk_data->base = base;
 	clk_data->clk_data.num = num_clks;
+
+	for (i = 0; i < num_clks; i++)
+		clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
 
 	s10_clk_register_pll(s10_pll_clks, ARRAY_SIZE(s10_pll_clks), clk_data);