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mfd: syscon: Fix null pointer dereference in of_syscon_register()

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kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: e15d7f2b81 ("mfd: syscon: Use a unique name with regmap_config")
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231204092443.2462115-1-chentao@kylinos.cn
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Kunwu Chan 2023-12-04 17:24:43 +08:00 committed by Lee Jones
parent 0c679fffd6
commit 41673c66b3
1 changed files with 4 additions and 0 deletions
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4
drivers/mfd/syscon.c
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@ -105,6 +105,10 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
}
syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%pa", np, &res.start);
if (!syscon_config.name) {
ret = -ENOMEM;
goto err_regmap;
}
syscon_config.reg_stride = reg_io_width;
syscon_config.val_bits = reg_io_width * 8;
syscon_config.max_register = resource_size(&res) - reg_io_width;