Subject: [PATCH] arm: kernel: add NULL pointer check in early_mem()

From: Austin Kim <[email-masked]>
Date: Fri, 3 Apr 2026 15:08:55 +0900

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 <[email-masked]>
---
 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