4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Aleksandr Mishin <amishin@xxxxxxxxxx>
[ Upstream commit ffc17e1479e8e9459b7afa80e5d9d40d0dd78abb ]
In case of error in build_tokens_sysfs(), all the memory that has been
allocated is freed at end of this function. But then free_group() is
called which performs memory deallocation again.
Also, instead of free_group() call, there should be exit_dell_smbios_smm()
and exit_dell_smbios_wmi() calls, since there is initialization, but there
is no release of resources in case of an error.
Fix these issues by replacing free_group() call with
exit_dell_smbios_wmi() and exit_dell_smbios_smm().
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 33b9ca1e53b4 ("platform/x86: dell-smbios: Add a sysfs interface for SMBIOS tokens")
Signed-off-by: Aleksandr Mishin <amishin@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240830065428.9544-1-amishin@xxxxxxxxxx
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/platform/x86/dell-smbios-base.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/dell-smbios-base.c b/drivers/platform/x86/dell-smbios-base.c
index 9e9fc5155789..f5299edb83f5 100644
--- a/drivers/platform/x86/dell-smbios-base.c
+++ b/drivers/platform/x86/dell-smbios-base.c
@@ -613,7 +613,10 @@ static int __init dell_smbios_init(void)
return 0;
fail_sysfs:
- free_group(platform_device);
+ if (!wmi)
+ exit_dell_smbios_wmi();
+ if (!smm)
+ exit_dell_smbios_smm();
fail_create_group:
platform_device_del(platform_device);
--
2.43.0
