From: Andy Adamson <andros@xxxxxxxxxx>
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
cc:stable@xxxxxxxxxx [2.6.39]
---
fs/nfs/nfs4filelayout.c | 15 ++++++++++-----
1 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 2cfeaeb..f0414ee 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -551,13 +551,18 @@ filelayout_decode_layout(struct pnfs_layout_hdr *flo,
__func__, nfl_util, fl->num_fh, fl->first_stripe_index,
fl->pattern_offset);
- if (!fl->num_fh)
+ /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
+ * Futher checking is done in filelayout_check_layout */
+ if (fl->num_fh < 0 || fl->num_fh >
+ max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
goto out_err;
- fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
- gfp_flags);
- if (!fl->fh_array)
- goto out_err;
+ if (fl->num_fh > 0) {
+ fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
+ gfp_flags);
+ if (!fl->fh_array)
+ goto out_err;
+ }
for (i = 0; i < fl->num_fh; i++) {
/* Do we want to use a mempool here? */
--
1.7.3.1
--
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