[PATCH] mm/page_alloc.c: fix early params garbage value accesses

[mateusznosek0]

From: Mateusz Nosek <mateusznos...@gmail.com>

Previously in '__init early_init_on_alloc' and '__init early_init_on_free'
the return values from 'kstrtobool' were not handled properly. That caused
potential garbage value read from variable 'bool_result'. Introduced patch
fixes error handling.

Signed-off-by: Mateusz Nosek <mateusznos...@gmail.com>
---
 mm/page_alloc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b699d273d6e..112e5a63f9ca 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -155,16 +155,16 @@ static int __init early_init_on_alloc(char *buf)
        int ret;
        bool bool_result;
 
-       if (!buf)
-               return -EINVAL;
        ret = kstrtobool(buf, &bool_result);
+       if (ret)
+               return ret;
        if (bool_result && page_poisoning_enabled())
                pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take 
precedence over init_on_alloc\n");
        if (bool_result)
                static_branch_enable(&init_on_alloc);
        else
                static_branch_disable(&init_on_alloc);
-       return ret;
+       return 0;
 }
 early_param("init_on_alloc", early_init_on_alloc);
 
@@ -173,16 +173,16 @@ static int __init early_init_on_free(char *buf)
        int ret;
        bool bool_result;
 
-       if (!buf)
-               return -EINVAL;
        ret = kstrtobool(buf, &bool_result);
+       if (ret)
+               return ret;
        if (bool_result && page_poisoning_enabled())
                pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, will take 
precedence over init_on_free\n");
        if (bool_result)
                static_branch_enable(&init_on_free);
        else
                static_branch_disable(&init_on_free);
-       return ret;
+       return 0;
 }
 early_param("init_on_free", early_init_on_free);
 
-- 
2.20.1