linux-kernel - [PATCH v2 2/3] regmap: debugfs: Fix kmemleak in regmap_debugfs

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Date:   Tue,  6 Mar 2018 19:04:02 +0800
From:   Jeffy Chen <jeffy.chen@...k-chips.com>
To:     linux-kernel@...r.kernel.org
Cc:     Jeffy Chen <jeffy.chen@...k-chips.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v2 2/3] regmap: debugfs: Fix kmemleak in regmap_debugfs_init

Use map->debugfs_name to store allocated debugfs name, so it would be
freed in regmap_debugfs_exit().

Kmemleak reported:
unreferenced object 0xffffffc0cf78cf00 (size 128):
  comm "swapper/0", pid 1, jiffies 4294669168 (age 89.152s)
  hex dump (first 32 bytes):
    64 75 6d 6d 79 32 33 00 00 00 00 00 00 00 00 00  dummy23.........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000027429160>] kmemleak_alloc+0x58/0x8c
    [<0000000081861ddf>] __kmalloc_track_caller+0x1dc/0x2bc
    [<00000000258a341f>] kvasprintf+0xd0/0x168
    [<00000000f3243f27>] kasprintf+0xac/0xd8
    [<000000005f585642>] regmap_debugfs_init+0x1a0/0x3b0
    [<000000002c08b110>] __regmap_init+0x12b8/0x135c
    [<00000000f64bcddb>] __regmap_init_mmio_clk+0x70/0x84
    [<000000009c8f06b5>] of_syscon_register+0x278/0x378
    [<0000000087e6c121>] syscon_node_to_regmap+0x80/0xb0

Fixes: a430ab205d29 ("regmap: debugfs: Disambiguate dummy debugfs file name")
Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
---

 drivers/base/regmap/regmap-debugfs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index e3e7b91cc421..5479a183248f 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -570,15 +570,15 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
 		map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
 					      devname, name);
 		name = map->debugfs_name;
+	} else if (!map->dev) {
+		map->debugfs_name = kasprintf(GFP_KERNEL, "%s%d",
+					      devname, dummy_index);
+		name = map->debugfs_name;
+		dummy_index++;
 	} else {
 		name = devname;
 	}
 
-	if (!strcmp(name, "dummy")) {
-		name = kasprintf(GFP_KERNEL, "dummy%d", dummy_index);
-		dummy_index++;
-	}
-
 	map->debugfs = debugfs_create_dir(name, regmap_debugfs_root);
 	if (!map->debugfs) {
 		dev_warn(map->dev, "Failed to create debugfs directory\n");
-- 
2.11.0