4.19-stable review patch. If anyone has any objections, please let me know.
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From: Aleksandr Mishin amishin@t-argos.ru
[ 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@t-argos.ru Link: https://lore.kernel.org/r/20240830065428.9544-1-amishin@t-argos.ru Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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);