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pnfs/flexfiles: Fix PTR_ERR() dereferences in ff_layout_track_ds_error

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commit 8e04fdfadda75a849c649f7e50fe7d97772e1fcb upstream.

mirror->mirror_ds can be NULL if uninitialised, but can contain
a PTR_ERR() if call to GETDEVICEINFO failed.

Fixes: 65990d1afbd2 ("pNFS/flexfiles: Fix a deadlock on LAYOUTGET")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # 4.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2019-07-17 13:57:44 -04:00 committed by Greg Kroah-Hartman
parent eada919ddd
commit a471b42537
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@ -306,7 +306,7 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
if (status == 0)
return 0;
if (mirror->mirror_ds == NULL)
if (IS_ERR_OR_NULL(mirror->mirror_ds))
return -EINVAL;
dserr = kmalloc(sizeof(*dserr), gfp_flags);