of: Correct element count for two arrays in API of_parse_phandle_with_args_map()

of_parse_phandle_with_args_map() defines array @dummy_mask and @dummy_pass
these two arrays only need @MAX_PHANDLE_ARGS elements separately, but they
actually have (@MAX_PHANDLE_ARGS + 1) elements, One extra element doesn't
hurt anything except for some stack usage.

Fix by using (@MAX_PHANDLE_ARGS - 1) as max element index in initializer.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20250114-of_core_fix-v5-3-b8bafd00a86f@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f4ab4086b80f62c4d9ce428cdde042d0ed4febe2..2432e0f4646d1d829d5b94ae2d2b1717afe286cf 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1448,8 +1448,8 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
        char *pass_name __free(kfree) = kasprintf(GFP_KERNEL, "%s-map-pass-thru", stem_name);
        struct device_node *cur, *new = NULL;
        const __be32 *map, *mask, *pass;
-       static const __be32 dummy_mask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
-       static const __be32 dummy_pass[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(0) };
+       static const __be32 dummy_mask[] = { [0 ... (MAX_PHANDLE_ARGS - 1)] = cpu_to_be32(~0) };
+       static const __be32 dummy_pass[] = { [0 ... (MAX_PHANDLE_ARGS - 1)] = cpu_to_be32(0) };
        __be32 initial_match_array[MAX_PHANDLE_ARGS];
        const __be32 *match_array = initial_match_array;
        int i, ret, map_len, match;