x86/microcode/intel: Fix memleak in save_microcode_patch()

BugLink: https://bugs.launchpad.net/bugs/1835845
[ Upstream commit 0218c766263e70795c5eaa17d75ed54bca350950 ]

Free useless ucode_patch entry when it's replaced.

[ bp: Drop the memfree_patch() two-liner. ]

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Srinivas REDDY Eeda <srinivas.eeda@oracle.com>
Link: http://lkml.kernel.org/r/888102f0-fd22-459d-b090-a1bd8a00cb2b@default
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 1c2cfa0644aa979c97cc01a42925a44c25f9f852..97ccf4c3b45bec517605813b1f24518b10466002 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -190,8 +190,11 @@ static void save_microcode_patch(void *data, unsigned int size)
                        p = memdup_patch(data, size);
                        if (!p)
                                pr_err("Error allocating buffer %p\n", data);
-                       else
+                       else {
                                list_replace(&iter->plist, &p->plist);
+                               kfree(iter->data);
+                               kfree(iter);
+                       }
                }
        }