* [PATCH] arm: kernel: add NULL pointer check in early_mem()
@ 2026-04-03 6:08 Austin Kim
2026-04-20 5:04 ` Austin Kim
0 siblings, 1 reply; 2+ messages in thread
From: Austin Kim @ 2026-04-03 6:08 UTC (permalink / raw)
To: linux; +Cc: linux-arm-kernel, linux-kernel, austindh.kim
The 'early_mem' function handles memory-related boot parameters.
If the parameter 'p' is passed as NULL, it could lead to an
uninitialized or invalid memory access during parsing.
This patch adds a NULL pointer check at the beginning of the
function to return early if no argument is provided, ensuring
system stability during the early boot process.
Signed-off-by: Austin Kim <austindh.kim@gmail•com>
---
arch/arm/kernel/setup.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 0bfd66c7a..b718a7df3 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -830,6 +830,8 @@ static int __init early_mem(char *p)
u64 start;
char *endp;
+ if (!p)
+ return 1;
/*
* If the user specifies memory size, we
* blow away any automatically generated
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] arm: kernel: add NULL pointer check in early_mem()
2026-04-03 6:08 [PATCH] arm: kernel: add NULL pointer check in early_mem() Austin Kim
@ 2026-04-20 5:04 ` Austin Kim
0 siblings, 0 replies; 2+ messages in thread
From: Austin Kim @ 2026-04-20 5:04 UTC (permalink / raw)
To: linux; +Cc: linux-arm-kernel, linux-kernel
2026년 4월 3일 (금) 오후 3:08, Austin Kim <austindh.kim@gmail•com>님이 작성:
>
> The 'early_mem' function handles memory-related boot parameters.
> If the parameter 'p' is passed as NULL, it could lead to an
> uninitialized or invalid memory access during parsing.
>
> This patch adds a NULL pointer check at the beginning of the
> function to return early if no argument is provided, ensuring
> system stability during the early boot process.
>
> Signed-off-by: Austin Kim <austindh.kim@gmail•com>
> ---
> arch/arm/kernel/setup.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 0bfd66c7a..b718a7df3 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -830,6 +830,8 @@ static int __init early_mem(char *p)
> u64 start;
> char *endp;
>
> + if (!p)
> + return 1;
Hello, Maintainers
If you are available, would you please leave any comments over this patch?
BR,
Austin Kim
> /*
> * If the user specifies memory size, we
> * blow away any automatically generated
> --
> 2.34.1
>
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