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NFSv4: check return value of xdr_inline_decode

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Function xdr_inline_decode() will return a NULL pointer if the input
buffer does not have long enough buffer to decode nbytes of data.
However, in function decode_op_map(), the return value of
xdr_inline_decode() is not validated before it is used. This patch adds
a check to the return value of xdr_inline_decode().

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Pan Bian 2017-04-23 14:49:41 +08:00 committed by Trond Myklebust
parent 209aa23083
commit 4edabfd7d0
1 changed files with 2 additions and 0 deletions
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fs/nfs/nfs4xdr.c
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@ -5570,6 +5570,8 @@ static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
unsigned int i;
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EIO;
bitmap_words = be32_to_cpup(p++);
if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
return -EIO;