linux-kernel - [PATCH -next] kernel: kprobes: Use struct

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Message-ID: <20230725195424.3469242-1-ruanjinjie@huawei.com>
Date:   Tue, 25 Jul 2023 19:54:24 +0000
From:   Ruan Jinjie <ruanjinjie@...wei.com>
To:     <naveen.n.rao@...ux.ibm.com>, <anil.s.keshavamurthy@...el.com>,
        <davem@...emloft.net>, <mhiramat@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH -next] kernel: kprobes: Use struct_size()

Use struct_size() instead of hand-writing it, when allocating a structure
with a flex array.

This is less verbose.

Signed-off-by: Ruan Jinjie <ruanjinjie@...wei.com>
---
 kernel/kprobes.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1fc6095d502d..1d749a917b59 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2220,8 +2220,7 @@ int register_kretprobe(struct kretprobe *rp)
 		return -ENOMEM;
 
 	for (i = 0; i < rp->maxactive; i++) {
-		inst = kzalloc(sizeof(struct kretprobe_instance) +
-			       rp->data_size, GFP_KERNEL);
+		inst = kzalloc(struct_size(inst, data, rp->data_size), GFP_KERNEL);
 		if (inst == NULL) {
 			rethook_free(rp->rh);
 			rp->rh = NULL;
@@ -2244,8 +2243,7 @@ int register_kretprobe(struct kretprobe *rp)
 
 	rp->rph->rp = rp;
 	for (i = 0; i < rp->maxactive; i++) {
-		inst = kzalloc(sizeof(struct kretprobe_instance) +
-			       rp->data_size, GFP_KERNEL);
+		inst = kzalloc(struct_size(inst, data, rp->data_size), GFP_KERNEL);
 		if (inst == NULL) {
 			refcount_set(&rp->rph->ref, i);
 			free_rp_inst(rp);
-- 
2.34.1