linux-kernel - [PATCH -next] NFSD: Use struct_size() helpler in alloc

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Date:   Fri, 11 Nov 2022 17:18:35 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <chuck.lever@...cle.com>, <jlayton@...nel.org>
CC:     <linux-nfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH -next] NFSD: Use struct_size() helpler in alloc_session()

Use struct_size() helper to simplify the code, no functional changes.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 fs/nfsd/nfs4state.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2ec981fd2985..97badca3135e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1833,13 +1833,12 @@ static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
 	int numslots = fattrs->maxreqs;
 	int slotsize = slot_bytes(fattrs);
 	struct nfsd4_session *new;
-	int mem, i;
+	int i;
 
-	BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
-			+ sizeof(struct nfsd4_session) > PAGE_SIZE);
-	mem = numslots * sizeof(struct nfsd4_slot *);
+	BUILD_BUG_ON(struct_size(new, se_slots, NFSD_MAX_SLOTS_PER_SESSION)
+		     > PAGE_SIZE);
 
-	new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
+	new = kzalloc(struct_size(new, se_slots, numslots), GFP_KERNEL);
 	if (!new)
 		return NULL;
 	/* allocate each struct nfsd4_slot and data cache in one piece */
-- 
2.17.1