linux-kernel - [PATCH] bpf: use kmemdup() to replace kmalloc + memcpy

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Message-Id: <1639030882-92383-1-git-send-email-jiapeng.chong@linux.alibaba.com>
Date:   Thu,  9 Dec 2021 14:21:22 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     ast@...nel.org
Cc:     daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] bpf: use kmemdup() to replace kmalloc + memcpy

Eliminate the follow coccicheck warning:

./kernel/bpf/btf.c:6537:13-20: WARNING opportunity for kmemdup.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 kernel/bpf/btf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 10e7a65..94f0342 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6534,12 +6534,11 @@ static struct bpf_cand_cache *populate_cand_cache(struct bpf_cand_cache *cands,
 		bpf_free_cands_from_cache(*cc);
 		*cc = NULL;
 	}
-	new_cands = kmalloc(sizeof_cands(cands->cnt), GFP_KERNEL);
+	new_cands = kmemdup(cands, sizeof_cands(cands->cnt), GFP_KERNEL);
 	if (!new_cands) {
 		bpf_free_cands(cands);
 		return ERR_PTR(-ENOMEM);
 	}
-	memcpy(new_cands, cands, sizeof_cands(cands->cnt));
 	/* strdup the name, since it will stay in cache.
 	 * the cands->name points to strings in prog's BTF and the prog can be unloaded.
 	 */
-- 
1.8.3.1