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Commit c77efc1e authored by Kinglong Mee's avatar Kinglong Mee Committed by Trond Myklebust
Browse files

nfs/blocklayout: Check max uuids and devices before decoding 



Avoid nfs return uuids/devices larger than maximum.

Signed-off-by: default avatarKinglong Mee <kinglongmee@gmail.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent ecc2b88c

fs/nfs/blocklayout/dev.c

+12 −2
Original line number Diff line number Diff line
@@ -65,8 +65,8 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) 
		if (!p)

			return -EIO;

		b->simple.nr_sigs = be32_to_cpup(p++);

		if (!b->simple.nr_sigs) {

			dprintk("no signature\n");

		if (!b->simple.nr_sigs || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) {

			dprintk("Bad signature count: %d\n", b->simple.nr_sigs);

			return -EIO;

		}
@@ -105,7 +105,12 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) 
		p = xdr_inline_decode(xdr, 4);

		if (!p)

			return -EIO;



		b->concat.volumes_count = be32_to_cpup(p++);

		if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) {

			dprintk("Too many volumes: %d\n", b->concat.volumes_count);

			return -EIO;

		}



		p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);

		if (!p)
@@ -117,8 +122,13 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b) 
		p = xdr_inline_decode(xdr, 8 + 4);

		if (!p)

			return -EIO;



		p = xdr_decode_hyper(p, &b->stripe.chunk_size);

		b->stripe.volumes_count = be32_to_cpup(p++);

		if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) {

			dprintk("Too many volumes: %d\n", b->stripe.volumes_count);

			return -EIO;

		}



		p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);

		if (!p)