platform/x86/intel/tpmi: use cleanup helpers in mem_write()

In mem_write(), the temporary array returned by
parse_int_array_user() must be released on all exit paths.
Convert the array variable to use cleanup.h scope-based
cleanup so it is freed automatically on return.

This also moves the array declaration next to
parse_int_array_user() as required by cleanup.h usage
guidelines.

Fixes: 8e0a2fc68ec3 ("platform/x86/intel/tpmi: Use 32 bit aligned address for debugfs mem write")
Cc: stable@vger.kernel.org
Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
Link: https://patch.msgid.link/20260521130848.2860219-1-zhaojinming@uniontech.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/x86/intel/vsec_tpmi.c b/drivers/platform/x86/intel/vsec_tpmi.c
index 8c4e2474b30cd38a21795213bf52c6689bc98476..3b76cccb975f6bc854be5b061ce85df7d42e1ce8 100644 (file)
--- a/drivers/platform/x86/intel/vsec_tpmi.c
+++ b/drivers/platform/x86/intel/vsec_tpmi.c
@@ -50,6 +50,7 @@
 #include <linux/auxiliary_bus.h>
 #include <linux/bitfield.h>
 #include <linux/debugfs.h>
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/intel_tpmi.h>
 #include <linux/intel_vsec.h>
@@ -473,7 +474,7 @@ static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t l
        struct seq_file *m = file->private_data;
        struct intel_tpmi_pm_feature *pfs = m->private;
        u32 addr, value, punit, size;
-       u32 num_elems, *array;
+       u32 num_elems;
        void __iomem *mem;
        int ret;
 
@@ -481,15 +482,14 @@ static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t l
        if (!size)
                return -EIO;
 
+       u32 *array __free(kfree) = NULL;
        ret = parse_int_array_user(userbuf, len, (int **)&array);
        if (ret < 0)
                return ret;
 
        num_elems = *array;
-       if (num_elems != 3) {
-               ret = -EINVAL;
-               goto exit_write;
-       }
+       if (num_elems != 3)
+               return -EINVAL;
 
        punit = array[1];
        addr = array[2];
@@ -498,15 +498,11 @@ static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t l
        if (!IS_ALIGNED(addr, sizeof(u32)))
                return -EINVAL;
 
-       if (punit >= pfs->pfs_header.num_entries) {
-               ret = -EINVAL;
-               goto exit_write;
-       }
+       if (punit >= pfs->pfs_header.num_entries)
+               return -EINVAL;
 
-       if (addr >= size) {
-               ret = -EINVAL;
-               goto exit_write;
-       }
+       if (addr >= size)
+               return -EINVAL;
 
        mutex_lock(&tpmi_dev_lock);
 
@@ -525,9 +521,6 @@ static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t l
 unlock_mem_write:
        mutex_unlock(&tpmi_dev_lock);
 
-exit_write:
-       kfree(array);
-
        return ret;
 }