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lockd: fix decoding of TEST results

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[ Upstream commit b8db159239 ]

We fail to advance the read pointer when reading the stat.oh field that
identifies the lock-holder in a TEST result.

This turns out not to matter if the server is knfsd, which always
returns a zero-length field.  But other servers (Ganesha is an example)
may not do this.  The result is bad values in fcntl F_GETLK results.

Fix this.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
J. Bruce Fields 2018-11-26 11:36:52 -05:00 committed by Greg Kroah-Hartman
parent 5f7d707b15
commit a2b7010f76
2 changed files with 12 additions and 32 deletions
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22
fs/lockd/clnt4xdr.c
View File

@ -128,24 +128,14 @@ static void encode_netobj(struct xdr_stream *xdr,
static int decode_netobj(struct xdr_stream *xdr,
struct xdr_netobj *obj)
{
u32 length;
__be32 *p;
ssize_t ret;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
length = be32_to_cpup(p++);
if (unlikely(length > XDR_MAX_NETOBJ))
goto out_size;
obj->len = length;
obj->data = (u8 *)p;
ret = xdr_stream_decode_opaque_inline(xdr, (void *)&obj->data,
XDR_MAX_NETOBJ);
if (unlikely(ret < 0))
return -EIO;
obj->len = ret;
return 0;
out_size:
dprintk("NFS: returned netobj was too long: %u\n", length);
return -EIO;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*

22
fs/lockd/clntxdr.c
View File

@ -125,24 +125,14 @@ static void encode_netobj(struct xdr_stream *xdr,
static int decode_netobj(struct xdr_stream *xdr,
struct xdr_netobj *obj)
{
u32 length;
__be32 *p;
ssize_t ret;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
length = be32_to_cpup(p++);
if (unlikely(length > XDR_MAX_NETOBJ))
goto out_size;
obj->len = length;
obj->data = (u8 *)p;
ret = xdr_stream_decode_opaque_inline(xdr, (void *)&obj->data,
XDR_MAX_NETOBJ);
if (unlikely(ret < 0))
return -EIO;
obj->len = ret;
return 0;
out_size:
dprintk("NFS: returned netobj was too long: %u\n", length);
return -EIO;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*