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Commit 2bd3c63a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Trond Myklebust
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pnfs/blocklayout: reject too long signatures 



Instead of overwriting kernel memory reject too long signatures.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 68596bd1

fs/nfs/blocklayout/dev.c

+5 −0
Original line number Diff line number Diff line
@@ -65,6 +65,11 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) 
				return -EIO;

			p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);

			b->simple.sigs[i].sig_len = be32_to_cpup(p++);

			if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {

				pr_info("signature too long: %d\n",

					b->simple.sigs[i].sig_len);

				return -EIO;

			}



			p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);

			if (!p)