NFSv4/flexfiles: Fix invalid deref in FF_LAYOUT_DEVID_NODE()
If the attempt to instantiate the mirror's layout DS pointer failed,
then that pointer may hold a value of type ERR_PTR(), so we need
to check that before we dereference it.
Fixes: 65990d1afb
("pNFS/flexfiles: Fix a deadlock on LAYOUTGET")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Родитель
1a3466aed3
Коммит
108bb4afd3
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@ -132,16 +132,6 @@ FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
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generic_hdr);
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}
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static inline struct nfs4_deviceid_node *
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FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
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{
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if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt ||
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FF_LAYOUT_LSEG(lseg)->mirror_array[idx] == NULL ||
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FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds == NULL)
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return NULL;
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return &FF_LAYOUT_LSEG(lseg)->mirror_array[idx]->mirror_ds->id_node;
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}
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static inline struct nfs4_ff_layout_ds *
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FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
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{
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@ -151,9 +141,25 @@ FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
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static inline struct nfs4_ff_layout_mirror *
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FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
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{
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if (idx >= FF_LAYOUT_LSEG(lseg)->mirror_array_cnt)
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return NULL;
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return FF_LAYOUT_LSEG(lseg)->mirror_array[idx];
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struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
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if (idx < fls->mirror_array_cnt)
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return fls->mirror_array[idx];
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return NULL;
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}
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static inline struct nfs4_deviceid_node *
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FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
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{
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struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, idx);
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if (mirror != NULL) {
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struct nfs4_ff_layout_ds *mirror_ds = mirror->mirror_ds;
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if (!IS_ERR_OR_NULL(mirror_ds))
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return &mirror_ds->id_node;
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}
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return NULL;
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}
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static inline u32
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