linux-kernel - [PATCH] lib: cpu_rmap.c Refactor allocation size calculation in kzalloc()

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Message-ID: <20250930092327.27848-1-mehdi.benhadjkhelifa@gmail.com>
Date: Tue, 30 Sep 2025 10:23:12 +0100
From: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	david.hunter.linux@...il.com,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
Subject: [PATCH] lib: cpu_rmap.c Refactor allocation size calculation in kzalloc()

Wrap allocation size calculation in size_add() and size_mul() to avoid
any potential overflow.

Signed-off-by: Mehdi Ben Hadj Khelifa <mehdi.benhadjkhelifa@...il.com>
---
 lib/cpu_rmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/cpu_rmap.c b/lib/cpu_rmap.c
index f03d9be3f06b..18b2146a73d2 100644
--- a/lib/cpu_rmap.c
+++ b/lib/cpu_rmap.c
@@ -36,7 +36,7 @@ struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags)
 	obj_offset = ALIGN(offsetof(struct cpu_rmap, near[nr_cpu_ids]),
 			   sizeof(void *));
 
-	rmap = kzalloc(obj_offset + size * sizeof(rmap->obj[0]), flags);
+	rmap = kzalloc(size_add(obj_offset, size_mul(size, sizeof(rmap->obj[0]))), flags);
 	if (!rmap)
 		return NULL;
 
-- 
2.51.0