[PATCH 5.10 711/770] NFSD: Use struct_size() helper in alloc_session()

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>

[ Upstream commit 85a0d0c9a58002ef7d1bf5e3ea630f4fbd42a4f0 ]

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

Signed-off-by: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 d490b19d95ddf..9a8038bfaa0d5 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 */
-- 
2.43.0







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