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pnfs/blocklayout: reject too long signatures 

Instead of overwriting kernel memory reject too long signatures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2015-08-17 18:40:59 +02:00 committed by Trond Myklebust
parent 68596bd188
commit 2bd3c63a33
1 changed files with 5 additions and 0 deletions
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5
fs/nfs/blocklayout/dev.c
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@ -65,6 +65,11 @@ nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
return -EIO; return -EIO;
p = xdr_decode_hyper(p, &b->simple.sigs[i].offset); p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
b->simple.sigs[i].sig_len = be32_to_cpup(p++); 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); p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
if (!p) if (!p)