From: Daniel Baluta daniel.baluta@nxp.com
[ Upstream commit 2899872b627e99b7586fe3b6c9f861da1b4d5072 ]
As detected by kmemleak running on i.MX6ULL board:
nreferenced object 0xd8366600 (size 64): comm "swapper/0", pid 1, jiffies 4294937370 (age 933.220s) 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 e3 f3 ab fe d1 1b dd @20e4000........ backtrace: [<b0402aec>] kasprintf+0x2c/0x54 [<a6fbad2c>] regmap_debugfs_init+0x7c/0x31c [<9c8d91fa>] __regmap_init+0xb5c/0xcf4 [<5b1c3d2a>] of_syscon_register+0x164/0x2c4 [<596a5d80>] syscon_node_to_regmap+0x64/0x90 [<49bd597b>] imx6ul_init_machine+0x34/0xa0 [<250a4dac>] customize_machine+0x1c/0x30 [<2d19fdaf>] do_one_initcall+0x7c/0x398 [<e6084469>] kernel_init_freeable+0x328/0x448 [<168c9101>] kernel_init+0x8/0x114 [<913268aa>] ret_from_fork+0x14/0x20 [<ce7b131a>] 0x0
Root cause is that map->debugfs_name is allocated using kasprintf and then the pointer is lost by assigning it other memory address.
Reported-by: Stefan Wahren stefan.wahren@i2se.com Signed-off-by: Daniel Baluta daniel.baluta@nxp.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/regmap/regmap-debugfs.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 87b562e49a43..c9687c8b2347 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -575,6 +575,8 @@ void regmap_debugfs_init(struct regmap *map, const char *name) }
if (!strcmp(name, "dummy")) { + kfree(map->debugfs_name); + map->debugfs_name = kasprintf(GFP_KERNEL, "dummy%d", dummy_index); name = map->debugfs_name;