x86/boot: Fix memory leak in default_get_smp_config()

When default_get_smp_config() is called with early == 1 and mpf->feature1
is non-zero, mpf is leaked because the return path does not do
early_memunmap().

Fix this and share a common exit routine.

Fixes: 5997efb96756 ("x86/boot: Use memremap() to map the MPF and MPC data")
Reported-by: Cfir Cohen <cfir@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907091942570.28240@chino.kir.corp.google.com

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 1bfe5c6..afac7cc 100644 (file)
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -546,17 +546,15 @@ void __init default_get_smp_config(unsigned int early)
                         * local APIC has default address
                         */
                        mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-                       return;
+                       goto out;
                }
 
                pr_info("Default MP configuration #%d\n", mpf->feature1);
                construct_default_ISA_mptable(mpf->feature1);
 
        } else if (mpf->physptr) {
-               if (check_physptr(mpf, early)) {
-                       early_memunmap(mpf, sizeof(*mpf));
-                       return;
-               }
+               if (check_physptr(mpf, early))
+                       goto out;
        } else
                BUG();
 
@@ -565,7 +563,7 @@ void __init default_get_smp_config(unsigned int early)
        /*
         * Only use the first configuration found.
         */
-
+out:
        early_memunmap(mpf, sizeof(*mpf));
 }