Messages in this thread Patch in this message | | | From | mateusznosek0@gmail ... | Subject | [PATCH] mm/page_alloc.c: fix early params garbage value accesses | Date | Wed, 16 Sep 2020 23:41:25 +0200 |
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From: Mateusz Nosek <mateusznosek0@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 <mateusznosek0@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
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