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| author | Chuck Lever <chuck.lever@oracle.com> | 2007-11-01 16:56:47 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2008-02-01 16:42:02 -0500 |
| commit | e5cff482c78a35b9f149a06aa777a1bd693864fb (patch) | |
| tree | 2b60e05b09f78f82b2c90b1877f175769d55b45c | |
| parent | 01b2969a8528b926f5e4d98161ae37053234475c (diff) | |
| download | linux-e5cff482c78a35b9f149a06aa777a1bd693864fb.tar.gz linux-e5cff482c78a35b9f149a06aa777a1bd693864fb.tar.bz2 linux-e5cff482c78a35b9f149a06aa777a1bd693864fb.zip | |
SUNRPC: Use unsigned string lengths in xdr_decode_string_inplace
XDR strings, opaques, and net objects should all use unsigned lengths.
To wit, RFC 4506 says:
4.2. Unsigned Integer
An XDR unsigned integer is a 32-bit datum that encodes a non-negative
integer in the range [0,4294967295].
...
4.11. String
The standard defines a string of n (numbered 0 through n-1) ASCII
bytes to be the number n encoded as an unsigned integer (as described
above), and followed by the n bytes of the string.
After this patch, xdr_decode_string_inplace now matches the other XDR
string and array helpers that take a string length argument. See:
xdr_encode_opaque_fixed, xdr_encode_opaque, xdr_encode_array
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-By: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
| -rw-r--r-- | include/linux/sunrpc/xdr.h | 3 | ||||
| -rw-r--r-- | net/sunrpc/xdr.c | 8 |
2 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h index 0751c9464d0f..e4057d729f03 100644 --- a/include/linux/sunrpc/xdr.h +++ b/include/linux/sunrpc/xdr.h @@ -112,7 +112,8 @@ struct xdr_buf { __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len); __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len); __be32 *xdr_encode_string(__be32 *p, const char *s); -__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, int *lenp, int maxlen); +__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp, + unsigned int maxlen); __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *); __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *); diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 54264062ea69..995c3fdc16c2 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -96,11 +96,13 @@ xdr_encode_string(__be32 *p, const char *string) EXPORT_SYMBOL(xdr_encode_string); __be32 * -xdr_decode_string_inplace(__be32 *p, char **sp, int *lenp, int maxlen) +xdr_decode_string_inplace(__be32 *p, char **sp, + unsigned int *lenp, unsigned int maxlen) { - unsigned int len; + u32 len; - if ((len = ntohl(*p++)) > maxlen) + len = ntohl(*p++); + if (len > maxlen) return NULL; *lenp = len; *sp = (char *) p; |