Commit 6da59ce2 authored by Trond Myklebust's avatar Trond Myklebust Committed by Anna Schumaker

NFSv4: Replace the open coded decode_opaque_inline() with the new generic

Also ensure that we always check that the size of the decoded object
matches the expectation that it must be smaller than NFS4_OPAQUE_LIMIT.
This should be true for all the current users of decode_opaque_inline(),
including decode_ace(), decode_pathname(), decode_attr_fs_locations()
and decode_exchange_id().

Note that this allows us to get rid of a number of existing checks in
decode_exchange_id(),
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent ab6e9aaf
...@@ -3050,20 +3050,15 @@ static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) ...@@ -3050,20 +3050,15 @@ static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string) static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{ {
__be32 *p; ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
NFS4_OPAQUE_LIMIT);
p = xdr_inline_decode(xdr, 4); if (unlikely(ret < 0)) {
if (unlikely(!p)) if (ret == -EBADMSG)
goto out_overflow;
*len = be32_to_cpup(p);
p = xdr_inline_decode(xdr, *len);
if (unlikely(!p))
goto out_overflow;
*string = (char *)p;
return 0;
out_overflow:
print_overflow_msg(__func__, xdr); print_overflow_msg(__func__, xdr);
return -EIO; return -EIO;
}
*len = ret;
return 0;
} }
static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr) static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
...@@ -5645,8 +5640,6 @@ static int decode_exchange_id(struct xdr_stream *xdr, ...@@ -5645,8 +5640,6 @@ static int decode_exchange_id(struct xdr_stream *xdr,
status = decode_opaque_inline(xdr, &dummy, &dummy_str); status = decode_opaque_inline(xdr, &dummy, &dummy_str);
if (unlikely(status)) if (unlikely(status))
return status; return status;
if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
return -EIO;
memcpy(res->server_owner->major_id, dummy_str, dummy); memcpy(res->server_owner->major_id, dummy_str, dummy);
res->server_owner->major_id_sz = dummy; res->server_owner->major_id_sz = dummy;
...@@ -5654,8 +5647,6 @@ static int decode_exchange_id(struct xdr_stream *xdr, ...@@ -5654,8 +5647,6 @@ static int decode_exchange_id(struct xdr_stream *xdr,
status = decode_opaque_inline(xdr, &dummy, &dummy_str); status = decode_opaque_inline(xdr, &dummy, &dummy_str);
if (unlikely(status)) if (unlikely(status))
return status; return status;
if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
return -EIO;
memcpy(res->server_scope->server_scope, dummy_str, dummy); memcpy(res->server_scope->server_scope, dummy_str, dummy);
res->server_scope->server_scope_sz = dummy; res->server_scope->server_scope_sz = dummy;
...@@ -5670,16 +5661,12 @@ static int decode_exchange_id(struct xdr_stream *xdr, ...@@ -5670,16 +5661,12 @@ static int decode_exchange_id(struct xdr_stream *xdr,
status = decode_opaque_inline(xdr, &dummy, &dummy_str); status = decode_opaque_inline(xdr, &dummy, &dummy_str);
if (unlikely(status)) if (unlikely(status))
return status; return status;
if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
return -EIO;
memcpy(res->impl_id->domain, dummy_str, dummy); memcpy(res->impl_id->domain, dummy_str, dummy);
/* nii_name */ /* nii_name */
status = decode_opaque_inline(xdr, &dummy, &dummy_str); status = decode_opaque_inline(xdr, &dummy, &dummy_str);
if (unlikely(status)) if (unlikely(status))
return status; return status;
if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
return -EIO;
memcpy(res->impl_id->name, dummy_str, dummy); memcpy(res->impl_id->name, dummy_str, dummy);
/* nii_date */ /* nii_date */
......
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