linux-kernel - [PATCH] boot: simple_alloc: check after increasing memory allocation

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Date:   Mon, 19 Dec 2022 10:18:16 +0800
From:   Li zeming <zeming@...china.com>
To:     mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        gregkh@...uxfoundation.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Li zeming <zeming@...china.com>
Subject: [PATCH] boot: simple_alloc: check after increasing memory allocation

The pointer new adds judgment and should help with program robustness.

Signed-off-by: Li zeming <zeming@...china.com>
---
 arch/powerpc/boot/simple_alloc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/boot/simple_alloc.c b/arch/powerpc/boot/simple_alloc.c
index 267d6524caac..db9aaa5face3 100644
--- a/arch/powerpc/boot/simple_alloc.c
+++ b/arch/powerpc/boot/simple_alloc.c
@@ -112,7 +112,9 @@ static void *simple_realloc(void *ptr, unsigned long size)
 		return ptr;
 
 	new = simple_malloc(size);
-	memcpy(new, ptr, p->size);
+	if (new)
+		memcpy(new, ptr, p->size);
+
 	simple_free(ptr);
 	return new;
 }
-- 
2.18.2