powerpc/papr_scm: Fix leaking 'bus_desc.provider_name' in some paths

commit 5649607a8d0b0e019a4db14aab3de1e16c3a2b4f upstream.

String 'bus_desc.provider_name' allocated inside
papr_scm_nvdimm_init() will leaks in case call to
nvdimm_bus_register() fails or when papr_scm_remove() is called.

This minor patch ensures that 'bus_desc.provider_name' is freed in
error path for nvdimm_bus_register() as well as in papr_scm_remove().

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200122155140.120429-1-vaibhav@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index ee07d07..66fd517 100644 (file)
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -342,6 +342,7 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
        p->bus = nvdimm_bus_register(NULL, &p->bus_desc);
        if (!p->bus) {
                dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn);
+               kfree(p->bus_desc.provider_name);
                return -ENXIO;
        }
 
@@ -498,6 +499,7 @@ static int papr_scm_remove(struct platform_device *pdev)
 
        nvdimm_bus_unregister(p->bus);
        drc_pmem_unbind(p);
+       kfree(p->bus_desc.provider_name);
        kfree(p);
 
        return 0;