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NFSv4/pnfs: Ensure pnfs_parse_lgopen() won't try to parse uninitialised data 

We need to ensure that pnfs_parse_lgopen() doesn't try to parse a
struct nfs4_layoutget_res that was not filled by a successful call
to decode_layoutget(). This can happen if we performed a cached open,
or if either the OP_ACCESS or OP_GETATTR operations preceding the
OP_LAYOUTGET in the compound returned an error.

By initialising the 'status' field to NFS4ERR_DELAY, we ensure that
pnfs_parse_lgopen() won't try to interpret the structure.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2017-02-01 20:42:44 -05:00 committed by Trond Myklebust
parent 30ae2412e9
commit d49e0d5b99
1 changed files with 2 additions and 1 deletions
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3
fs/nfs/pnfs.c
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@ -994,7 +994,8 @@ pnfs_alloc_init_layoutget_args(struct inode *ino,
lgp->args.layout.pglen = max_pages * PAGE_SIZE;
lgp->res.layoutp = &lgp->args.layout;
/* Don't confuse uninitialised result and success */
lgp->res.status = -NFS4ERR_DELAY;
lgp->args.minlength = PAGE_SIZE;
if (lgp->args.minlength > range->length)