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authorChuck Lever2007-11-01 16:56:47 -0400
committerJ. Bruce Fields2008-02-01 16:42:02 -0500
commite5cff482c78a35b9f149a06aa777a1bd693864fb (patch)
tree2b60e05b09f78f82b2c90b1877f175769d55b45c
parent01b2969a8528b926f5e4d98161ae37053234475c (diff)
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.h3
-rw-r--r--net/sunrpc/xdr.c8
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;