regmap: debugfs: Fix a memory leak when calling regmap_attach_dev

After initializing the regmap through
syscon_regmap_lookup_by_compatible, then regmap_attach_dev to the
device, because the debugfs_name has been allocated, there is no
need to redistribute it again

unreferenced object 0xd8399b80 (size 64):
  comm "swapper/0", pid 1, jiffies 4294937641 (age 278.590s)
  hex dump (first 32 bytes):
	64 75 6d 6d 79 2d 69 6f 6d 75 78 63 2d 67 70 72
dummy-iomuxc-gpr
	40 32 30 65 34 30 30 30 00 7f 52 5b d8 7e 42 69
@20e4000..R[.~Bi
  backtrace:
    [<ca384d6f>] kasprintf+0x2c/0x54
    [<6ad3bbc2>] regmap_debugfs_init+0xdc/0x2fc
    [<bc4181da>] __regmap_init+0xc38/0xd88
    [<1f7e0609>] of_syscon_register+0x168/0x294
    [<735e8766>] device_node_get_regmap+0x6c/0x98
    [<d96c8982>] imx6ul_init_machine+0x20/0x88
    [<0456565b>] customize_machine+0x1c/0x30
    [<d07393d8>] do_one_initcall+0x80/0x3ac
    [<7e584867>] kernel_init_freeable+0x170/0x1f0
    [<80074741>] kernel_init+0x8/0x120
    [<285d6f28>] ret_from_fork+0x14/0x20
    [<00000000>] 0x0

Fixes: 9b947a13e7f6 ("regmap: use debugfs even when no device")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Link: https://lore.kernel.org/r/20201229105046.41984-1-xiaolei.wang@windriver.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 8dfac7f..bf03cd3 100644 (file)
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -582,18 +582,25 @@ void regmap_debugfs_init(struct regmap *map)
                devname = dev_name(map->dev);
 
        if (name) {
-               map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
+               if (!map->debugfs_name) {
+                       map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
                                              devname, name);
+                       if (!map->debugfs_name)
+                               return;
+               }
                name = map->debugfs_name;
        } else {
                name = devname;
        }
 
        if (!strcmp(name, "dummy")) {
-               kfree(map->debugfs_name);
+               if (!map->debugfs_name)
+                       kfree(map->debugfs_name);
 
                map->debugfs_name = kasprintf(GFP_KERNEL, "dummy%d",
                                                dummy_index);
+               if (!map->debugfs_name)
+                               return;
                name = map->debugfs_name;
                dummy_index++;
        }