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NFSD: clean up alloc_init_deleg()

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Modify the conditional statement for null pointer check in the function
'alloc_init_deleg' to make this function more robust and clear. Otherwise,
this function may have potential pointer dereference problem in the future,
when modifying or expanding the nfs4_delegation structure.

Signed-off-by: Sicong Huang <huangsicong@iie.ac.cn>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Sicong Huang 2023-10-12 16:34:58 +08:00 committed by Chuck Lever
parent 6939ace1f2
commit 2ffda63c98
1 changed files with 4 additions and 2 deletions
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6
fs/nfsd/nfs4state.c
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@ -1160,6 +1160,7 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
struct nfs4_clnt_odstate *odstate, u32 dl_type)
{
struct nfs4_delegation *dp;
struct nfs4_stid *stid;
long n;
dprintk("NFSD alloc_init_deleg\n");
@ -1168,9 +1169,10 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
goto out_dec;
if (delegation_blocked(&fp->fi_fhandle))
goto out_dec;
dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
if (dp == NULL)
stid = nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg);
if (stid == NULL)
goto out_dec;
dp = delegstateid(stid);
/*
* delegation seqid's are never incremented. The 4.1 special