[PATCH 5.4 54/84] cpufreq: fix memory leak in sun50i_cpufreq_nvmem_probe

Greg Kroah-Hartman
2022-05-04T16:53:34Z

From: Xiaobing Luo <luoxiaobing0926@gmail.com>

[ Upstream commit 1aa24a8f3b5133dae4bc1e57427e345445f3e902 ]

--------------------------------------------
unreferenced object 0xffff000010742a00 (size 128):
comm "swapper/0", pid 1, jiffies 4294902015 (age 1187.652s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000b4dfebaa>] __kmalloc+0x338/0x474
[<00000000d6e716db>] sun50i_cpufreq_nvmem_probe+0xc4/0x36c
[<000000007d6082a0>] platform_probe+0x98/0x11c
[<00000000c990f549>] really_probe+0x234/0x5a0
[<000000002d9fecc6>] __driver_probe_device+0x194/0x224
[<00000000cf0b94fa>] driver_probe_device+0x64/0x13c
[<00000000f238e4cf>] __device_attach_driver+0xf8/0x180
[<000000006720e418>] bus_for_each_drv+0xf8/0x160
[<00000000df4f14f6>] __device_attach+0x174/0x29c
[<00000000782002fb>] device_initial_probe+0x20/0x30
[<00000000c2681b06>] bus_probe_device+0xfc/0x110
[<00000000964cf3bd>] device_add+0x5f0/0xcd0
[<000000004b9264e3>] platform_device_add+0x198/0x390
[<00000000fa82a9d0>] platform_device_register_full+0x178/0x210
[<000000009a5daf13>] sun50i_cpufreq_init+0xf8/0x168
[<000000000377cc7c>] do_one_initcall+0xe4/0x570
--------------------------------------------

if sun50i_cpufreq_get_efuse failed, then opp_tables leak.

Fixes: f328584f7bff ("cpufreq: Add sun50i nvmem based CPU scaling driver")
Signed-off-by: Xiaobing Luo <luoxiaobing0926@gmail.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/cpufreq/sun50i-cpufreq-nvmem.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 2deed8d8773f..75e1bf3a08f7 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -98,8 +98,10 @@ static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
return -ENOMEM;

ret = sun50i_cpufreq_get_efuse(&speed);
- if (ret)
+ if (ret) {
+ kfree(opp_tables);
return ret;
+ }

snprintf(name, MAX_NAME_LEN, "speed%d", speed);

--
2.35.1