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nfs: Check whether a layout pointer is NULL before free it

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The new layout pointer in pnfs_find_alloc_layout() may be NULL because of
out of memory. we must do some check work, otherwise pnfs_free_layout_hdr()
will go wrong because it can not deal with a NULL pointer.

Signed-off-by: Yanchuan Nian <ycnian@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Yanchuan Nian 2012-10-31 16:05:48 +08:00 committed by Trond Myklebust
parent 8d96b10639
commit 7175fe9015
1 changed files with 2 additions and 2 deletions
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4
fs/nfs/pnfs.c
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@ -925,8 +925,8 @@ pnfs_find_alloc_layout(struct inode *ino,
if (likely(nfsi->layout == NULL)) { /* Won the race? */
nfsi->layout = new;
return new;
}
pnfs_free_layout_hdr(new);
} else if (new != NULL)
pnfs_free_layout_hdr(new);
out_existing:
pnfs_get_layout_hdr(nfsi->layout);
return nfsi->layout;